Synonyms for Hollow: 25 Better Words for Different Contexts
The word hollow can describe something that is empty inside, a surface that curves inward, a sound that echoes, or a statement or situation that lacks sincerity, value, or meaning. It can also function as a noun for a cavity or low area and as a verb meaning to make something hollow or excavate it.
Because these meanings are different, there is no single synonym that works everywhere. Empty may replace hollow when discussing an object with nothing inside, while cavity works better for a physical space. For figurative uses, words such as meaningless, worthless, or insincere may be more precise.
The key is to choose a synonym based on the particular meaning of hollow you intend.
Quick Answer
The closest synonyms for hollow include empty, vacant, void, cavity, hole, concave, sunken, depression, meaningless, worthless, insincere, artificial, dull, echoing, and excavate. The best choice depends on context: empty describes a lack of contents, cavity describes an enclosed space, concave describes an inward-curving surface, and meaningless describes something lacking significance.
Core Synonyms for Hollow
Synonyms for Empty Spaces and Openings
These words are useful when hollow refers to something that contains an empty space or has nothing inside. The best choice depends on whether you are describing a general empty area, an opening, or an enclosed cavity.
| Word | Relationship | Meaning | Strength | Formality | Best Context |
|---|---|---|---|---|---|
| Empty | Direct/near synonym | Containing nothing | Similar | Neutral | Objects, spaces |
| Vacant | Near synonym | Empty or unoccupied | Similar | Neutral/Formal | Places, spaces |
| Void | Near synonym | Completely empty space | Strong | Formal/Literary | Abstract or physical spaces |
| Cavity | Contextual alternative | An enclosed empty space | Similar | Neutral/Technical | Objects, anatomy, structures |
| Hole | Contextual alternative | An opening or empty space | Similar | Neutral | Physical objects |
Words for Sunken or Inward-Curving Surfaces
When hollow describes the shape of a surface rather than an empty interior, these terms can be more precise. They refer to areas that curve inward or sit below the surrounding surface.
| Word | Relationship | Meaning | Strength | Formality | Best Context |
|---|---|---|---|---|---|
| Concave | Contextual alternative | Curving inward | Precise | Formal/Technical | Surfaces |
| Sunken | Near synonym | Lower than the surrounding area | Similar | Neutral | Surfaces, features |
| Depression | Contextual alternative | A lowered area or indentation | Similar | Neutral/Formal | Surfaces, land |
| Indentation | Contextual alternative | A mark or area pressed inward | Similar | Formal/Technical | Surfaces |
Alternatives for Meaningless or Insincere
In a figurative sense, hollow can describe words, actions, promises, or emotions that lack genuine meaning or sincerity. These alternatives emphasize different aspects of that figurative meaning.
| Word | Relationship | Meaning | Strength | Formality | Best Context |
|---|---|---|---|---|---|
| Meaningless | Contextual alternative | Lacking significance | Similar | Neutral | Words, actions, events |
| Pointless | Near synonym | Having no useful purpose | Similar | Neutral | Actions, arguments |
| Worthless | Contextual alternative | Having little or no value | Strong | Neutral | Promises, claims, things |
| Insincere | Contextual alternative | Not genuine or heartfelt | Similar | Neutral/Formal | Words, laughter, emotions |
| False | Near synonym | Not true or genuine | Similar | Neutral | Claims, statements |
| Artificial | Contextual alternative | Not genuine or natural | Similar | Neutral | Behavior, emotions, sounds |
| Cynical | Contextual alternative | Showing distrust or lack of sincerity | Stronger | Neutral/Formal | Attitudes, remarks |
Words Related to Hollow or Deep Sounds
The word hollow can also describe a sound that seems deep, dull, resonant, or partially muffled. These alternatives are useful when discussing voices, echoes, or sounds produced in enclosed spaces.
| Word | Relationship | Meaning | Strength | Formality | Best Context |
|---|---|---|---|---|---|
| Dull | Contextual alternative | Lacking a clear, bright quality in sound | Similar | Neutral | Sounds |
| Echoing | Contextual alternative | Producing or carrying an echo | Similar | Neutral | Sounds, spaces |
| Muffled | Contextual alternative | Softened or obscured in sound | Different emphasis | Neutral | Sounds |
| Low | Contextual alternative | Deep in pitch | Different emphasis | Neutral | Voices, sounds |
| Deep | Contextual alternative | Low in pitch or strongly resonant | Different emphasis | Neutral | Sounds |
Words for Creating a Hollow Space
Some terms relate to hollow as an action rather than a description. They refer to removing material from an object, surface, or area to create an empty space.
| Word | Relationship | Meaning | Strength | Formality | Best Context |
|---|---|---|---|---|---|
| Excavate | Contextual alternative | Remove material to create a cavity | Similar action | Formal | Digging, construction |
| Scoop out | Contextual alternative | Remove material from inside | Similar action | Informal/Neutral | Food, materials |
| Dig out | Contextual alternative | Remove material by digging | Similar action | Neutral | Soil, earth |
| Gouge out | Contextual alternative | Remove material forcefully | Stronger | Neutral | Material removal |
The classifications above reflect the fact that dictionary and thesaurus sources divide hollow into several senses rather than treating all alternatives as interchangeable.
What Does “Hollow” Mean?
Hollow is an adjective, noun, and verb with several related meanings.
As an adjective, it can describe something that has an empty space inside, such as a hollow tree. It can also describe an inward-curving surface, such as hollow cheeks. In relation to sound, it can mean low, dull, or echoing. Figuratively, hollow can describe words, promises, victories, or situations that lack real value, significance, or sincerity.
As a noun, a hollow can mean an empty space, cavity, depression, or—in American usage—a small valley. As a verb, to hollow means to make something hollow or remove material from it.
Pronunciation: US /ˈhɑːloʊ/, UK /ˈhɒləʊ/.
Synonyms for Hollow Meaning “Empty Inside”
When hollow means that something contains an empty space rather than being solid throughout, the closest alternatives include:
Empty
Empty is the most general choice. It means that a container, space, or object contains nothing or very little.
Example:
The box was empty.
Use hollow instead when you specifically want to emphasize that an object has an empty interior.
Example:
The tree has a hollow trunk.
Vacant
Vacant emphasizes that a space is unoccupied or unused rather than describing an object’s physical structure.
Example:
The building has several vacant rooms.
It is therefore not always interchangeable with hollow.
Void
Void refers to an empty or unoccupied space and often sounds more formal or literary.
Example:
The machine left a void beneath the surface.
It can also describe an abstract absence, making it broader than hollow in some contexts.
Cavity
Cavity is a precise word for an enclosed empty space within something.
Example:
The engineers discovered a cavity inside the structure.
It is particularly useful in scientific, medical, engineering, and technical writing.
Hole
Hole is a common everyday alternative when the emphasis is on an opening or gap.
Example:
There was a hole in the wall.
However, hole does not necessarily mean that something is hollow throughout.
Synonyms for Hollow Meaning “Curving Inward”
When hollow describes a surface that curves inward, the best alternatives are concave, sunken, depressed, recessed, and indented.
Concave
Concave is the most precise technical alternative. It describes a surface that curves inward.
Example:
The inside of the bowl is concave.
Choose concave when geometric accuracy matters.
Sunken
Sunken describes something positioned lower than the surrounding surface.
Example:
The old building has sunken windows.
Depressed
Depressed can describe a surface that has been pressed or lowered.
Example:
The center of the panel is slightly depressed.
Recessed
Recessed is especially useful when something is deliberately set back into a surface.
Example:
The lights are recessed into the ceiling.
Indented
Indented describes a surface marked or pushed inward.
Example:
The metal was deeply indented.
Collins specifically groups concave, depressed, scooped, hollowed, excavated, sunken, and indented around the inward-curving sense of hollow.
Synonyms for Hollow Meaning “Meaningless or Without Value”
This figurative sense is common in expressions such as hollow victory, hollow promise, and hollow words.
Meaningless
Use meaningless when something lacks significance or real meaning.
Example:
His apology sounded meaningless after the same mistake happened again.
Pointless
Pointless emphasizes a lack of useful purpose or reason.
Example:
The argument became pointless after the decision had already been made.
Worthless
Worthless emphasizes a lack of value, usefulness, or effectiveness.
Example:
The guarantee proved worthless.
Futile
Futile means incapable of producing a useful result.
Example:
Their attempt to repair the damaged system was futile.
Empty
Empty can also be figurative when words, promises, or gestures contain no real substance.
Example:
The speech was full of empty promises.
Collins lists worthless, empty, useless, and vain among alternatives for the figurative sense of hollow.
Synonyms for Hollow Meaning “Insincere”
When hollow describes a laugh, promise, expression, or statement that does not feel genuine, the best alternatives include insincere, false, artificial, and sometimes cynical.
Insincere
Insincere is usually the clearest choice when something is not genuine.
Example:
Her apology sounded insincere.
False
False works when something is presented as genuine or true but is not.
Example:
His concern felt false.
Artificial
Artificial emphasizes a lack of naturalness or genuineness.
Example:
He gave an artificial smile.
Cynical
Cynical is more specific. It suggests distrust, skepticism, or a belief that people are motivated by self-interest.
Example:
His cynical response made the compliment sound hollow.
These are contextual alternatives rather than perfect substitutes in every sentence. Collins specifically identifies insincere, false, artificial, and cynical for the relevant figurative sense.
Synonyms for Hollow Meaning “Echoing or Dull in Sound”
When hollow describes sound, alternatives depend on what aspect of the sound you want to emphasize.
Echoing
Use echoing when the sound seems to reflect or reverberate.
Example:
His footsteps sounded echoing in the empty hallway.
Dull
Use dull when the sound lacks brightness or sharpness.
Example:
The drum produced a dull thud.
Muffled
Use muffled when a sound is softened or partly blocked.
Example:
We heard a muffled voice behind the door.
Low
Use low when the main feature is pitch.
Example:
He spoke in a low voice.
Deep
Use deep when a sound has a low, resonant quality.
Example:
Thunder rolled with a deep rumble.
Cambridge describes hollow sound as resembling the sound made by hitting an empty container, while Collins gives dull, low, deep, and flat as contextual alternatives.
Synonyms for Hollow as a Noun
As a noun, hollow can refer to an empty space, depression, cavity, or low area.
Useful alternatives include:
- cavity — an enclosed empty space
- hole — an opening or empty space
- depression — a lower area in a surface
- dip — a small lowered area
- bowl — a broad, rounded depression
- recess — an area set back into something
- valley — a low area between higher land
- dale — a broad or open valley
For example:
Rainwater collected in a hollow.
Depending on the landscape, depression, dip, basin, or valley may be more precise.
Cambridge and Collins both distinguish the noun sense from the adjective senses and list alternatives such as cavity, hole, depression, cup, bowl, and valley in appropriate contexts.
Synonyms for Hollow as a Verb
As a verb, hollow means to remove material or make something hollow.
Useful alternatives include:
- excavate — remove earth or material, especially systematically
- dig out — remove material by digging
- scoop out — remove material from inside
- gouge out — remove material forcefully
- carve out — create a shape by cutting away material
Example:
Workers excavated the area beneath the structure.
Collins specifically lists scoop out, dig out, excavate, and gouge out for this verbal sense.
Which Word Should I Use?
| If you mean… | Best choice |
|---|---|
| Nothing inside | empty |
| An enclosed empty space | cavity |
| An opening | hole |
| A surface curving inward | concave |
| A lowered surface | sunken |
| A pressed-in mark | indentation |
| No meaning | meaningless |
| No useful purpose | pointless |
| No value | worthless |
| Not genuine | insincere |
| Not natural or genuine | artificial |
| An echoing quality | echoing |
| A low-pitched quality | deep or low |
| Removing material | excavate |
This context-based approach is more reliable than choosing a synonym from a general alphabetical list.
Hollow vs. Empty
Hollow and empty overlap, but they are not identical.
Empty generally means that something contains nothing. Hollow emphasizes an empty interior or cavity, often in something that has an outer structure.
Compare:
- The bottle is empty. → There is nothing inside.
- The tree trunk is hollow. → The trunk has an empty interior.
Empty also has broader everyday uses, while hollow can carry additional meanings involving sound, shape, insincerity, and lack of value.
Hollow vs. Concave
These words overlap when describing surfaces, but concave is more precise.
- Hollow can describe something that has a depression or curves inward.
- Concave specifically describes a surface that curves inward.
Example:
The spoon has a hollow shape.
The lens has a concave surface.
Use concave in technical or geometric contexts.
Hollow vs. Cavity
A cavity is specifically an empty space within something. Hollow can describe the object containing that space.
Compare:
The tree is hollow.
The tree contains a large cavity.
The first describes the tree’s condition; the second identifies the empty space itself.
Common Mistakes
1. Treating every synonym as interchangeable
Words such as empty, concave, meaningless, and insincere correspond to different senses of hollow. They cannot normally replace one another.
2. Using “vacant” for every physical object
Vacant usually describes a place or position that is unoccupied. It is not a universal substitute for hollow.
3. Using “hole” when you mean an enclosed cavity
A hole often suggests an opening. A cavity emphasizes an enclosed space.
4. Using “meaningless” for physical hollowness
Meaningless is figurative. It works for words, actions, promises, or events—not normally for a hollow tree.
5. Using “concave” for figurative meanings
Concave is primarily about physical shape. It does not mean “insincere” or “without value.”
Antonyms of Hollow
The best antonym depends on the sense.
When hollow means empty inside, its opposite can be solid, filled, or full. A solid object contains material throughout, while something filled or full has little or no empty space remaining.
- Solid
- Filled
- Full
In the sense of meaningless or without substance, hollow can be contrasted with meaningful, substantial, significant, or sincere. These alternatives suggest genuine value, importance, depth, or feeling rather than emptiness.
- Meaningful
- Substantial
- Significant
- Sincere
When hollow describes a sunken or inward-curving surface, contrasting terms include convex, raised, and elevated. Such words indicate a surface that curves outward or stands higher than the surrounding area.
- Convex
- Raised
- Elevated
Cambridge identifies solid as the direct opposite when hollow means having an empty interior.
FAQ
What is the closest synonym for hollow?
Empty is often the closest general synonym when hollow means containing an empty space. However, cavity may be more precise for the space itself, while concave is better for an inward-curving surface. Figurative uses require different alternatives, such as meaningless or insincere.
What is another word for hollow inside?
Depending on context, empty, vacant, void, or unfilled can express the idea of having nothing inside. Cavity is better when you mean the empty space itself rather than the condition of the object.
What is a synonym for a hollow sound?
Possible alternatives include echoing, dull, deep, low, and muffled, but each emphasizes a different quality. Echoing focuses on reverberation, low on pitch, and muffled on reduced clarity.
What is a synonym for a hollow victory?
A hollow victory is a victory that lacks real satisfaction, significance, or value. Depending on the sentence, alternatives may include empty victory, meaningless victory, or pyrrhic victory. However, pyrrhic adds the specific idea that the victory came at an excessive cost.
Is “empty” the same as “hollow”?
Not always. Empty usually focuses on the absence of contents, while hollow often emphasizes an empty interior, cavity, or lack of substance. Hollow also has meanings related to sound, shape, insincerity, and lack of value.
What is the opposite of hollow?
For the physical sense, the clearest opposite is solid. For the figurative sense, possible opposites include meaningful, substantial, sincere, or genuine, depending on what hollow means in the sentence.
Is “concave” a synonym for hollow?
Only in a specific physical context. Concave means curving inward, so it can replace hollow when the latter describes an inward-curving surface. It is not a synonym for figurative uses such as hollow promises.
What is the noun form of hollow?
Hollow itself can be a noun, meaning an empty space, depression, or low area. The abstract noun hollowness refers to the quality or state of being hollow, including figurative senses such as a lack of substance or sincerity.
Conclusion
The best synonym for hollow depends entirely on what you mean. For physical emptiness, choose empty or cavity; for inward-curving surfaces, use concave or sunken; for a lack of meaning, consider meaningless or pointless; and for insincerity, insincere or artificial may be more precise. For sounds, words such as echoing, dull, low, and deep capture different qualities.
Sophia Martinez is an ESL educator who specializes in teaching vocabulary and word meanings. She writes beginner-friendly content that helps learners understand synonyms and improve their English fluency step by step.
