dumb

American  

[duhm] / dʌm /

adjective

• dumber,
  comparative
• dumbest
  superlative

1. lacking intelligence or good judgment; stupid; dull-witted.

2. lacking the power of speech (offensive when applied to humans).

   a dumb animal.

3. temporarily unable to speak.

   dumb with astonishment.

4. refraining from any or much speech; silent.

5. made, done, etc., without speech.

6. lacking some usual property, characteristic, etc.

7. performed in pantomime; mimed.

8. Computers. pertaining to the inability to do processing locally.

   A dumb terminal can input, output, and display data, but cannot process it.

9. Nautical.

   1. (of a barge) without means of propulsion.

   2. (of any craft) without means of propulsion, steering, or signaling.

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verb phrase

1. dumb down to make or become less intellectual, simpler, or less sophisticated.

   to dumb down a textbook; American movies have dumbed down.

dumb British  

/ dʌm /

adjective

1. lacking the power to speak, either because of defects in the vocal organs or because of hereditary deafness

2. lacking the power of human speech

   dumb animals

3. temporarily lacking or bereft of the power to speak

   struck dumb

4. refraining from speech; uncommunicative

5. producing no sound; silent

   a dumb piano

6. made, done, or performed without speech

7. informal

   1. slow to understand; dim-witted

   2. foolish; stupid See also dumb down

8. (of a projectile or bomb) not guided to its target

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Sensitive Note

Dumb in the sense “lacking the power of speech” is perceived as insulting when describing humans (but not animals), probably because dumb also means “stupid; dull-witted.” The noun dummy in the sense “person who lacks the power of speech” is also perceived as insulting, as are the terms deaf-and-dumb, deaf-mute, and mute. The adjective hard of hearing is acceptable though not the term of choice, partly because it lacks directness. The preferred term is deaf, which makes no reference to an inability to speak or communicate; the capitalized word Deaf signals membership in this community.

Other Word Forms

Derived Forms

• dumbness
  noun
• quasi-dumb
  adjective
• dumbly
  adverb
• quasi-dumbly
  adverb

Inflected Forms

Adjectives

• dumber
  comparative
• dumbest
  superlative

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Etymology

Origin of dumb

First recorded before 1000; Old English; cognate with Old Norse dumbr, Gothic dumbs, Old Saxon dumb, Old High German tump, German dumm

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Explanation

Today, most of the time someone or something is described as dumb when it shows a lack of thought, like your dumb idea of wearing flip-flops in a snowstorm. Dumb is the Old English word that means "mute, speechless," and itself came from an even older word dheubh meaning "confusion, stupefaction, dizziness." Today, dumb still means "unable to speak," but it doesn't have anything to do with intelligence. Its other meaning, however, does. If you make a dumb mistake, it's something you could have avoided if you thought it through first.

Example Sentences

See Examples For:

dumb dumber dumbest

“But I was in the studio, and I was just like, ‘This is so dumb — this is not true.’

From Los Angeles Times ● Oct. 6, 2026

He said that AI critics have been called “bad, dumb and evil” but “the last week has shown we’re none of them.”

From The Wall Street Journal ● Sep. 15, 2026

The dumb conscripts are given instant gratification and money.

From Salon ● Sep. 6, 2026

"I'm not offended by all the dumb blonde jokes because I know I'm not dumb - and I'm not blonde either."

From BBC ● Aug. 26, 2026

Louella turned the stroller over and looked underneath it as if she thought Howard might have fallen through, which was pretty dumb.

From "The Best School Year Ever" by Barbara Robinson

Advertising student Catalina Cruz, 19, thinks AI is "making us dumber" because "people aren't able to think for themselves any more".

From Barron's ● Sep. 15, 2026

Any citizen who steps out of line risks the ire of an even dumber police force, riding around in cruisers that lift their design language from Ed Hardy clothing.

From Salon ● Sep. 6, 2026

Each day we live through this era, we get vastly dumber.

From Slate ● Aug. 29, 2026

Artificial general intelligence is moments away, they say, and we’ll all soon be dumber than ChatGPT.

From The Wall Street Journal ● Dec. 7, 2025

I never new before that I was dumber than a mouse.

From "Flowers for Algernon" by Daniel Keyes

“That’s the dumbest thing ever — it’s just trolling,” Gibney says.

From Los Angeles Times ● Oct. 6, 2026

The dumbest phrase in military history is Adolf Hitler saying “Let’s attack Russia in the winter.”

From Slate ● Jun. 24, 2026

NBA legend Charles Barkley branded the San Antonio Spurs "the dumbest basketball team in the history of civilisation" after the New York Knicks pulled off the biggest comeback in NBA Finals history.

From BBC ● Jun. 11, 2026

A spoof is only as successful as its dumbest joke, and these two films have plenty to choose from.

From Salon ● Jun. 11, 2026

There it was, the world’s dumbest bird, dipping its dumb head down so its orange button eye could stare back at him.

From "Wringer" by Jerry Spinelli

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Related Words

• dull
• foolish

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