stupid
Americanadjective
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lacking ordinary quickness and keenness of mind; slow-witted.
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characterized by or proceeding from mental dullness; foolish; senseless.
Sorry for asking a stupid question, but why is the answer four instead of five?
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tediously boring, especially due to lack of meaning or sense; inane; pointless.
He wished he'd never come to such a stupid party.
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annoying or irritating; troublesome.
Turn off that stupid radio.
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in a state of stupor; stupefied.
After a twelve-hour work day, she was stupid from fatigue.
noun
adjective
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lacking in common sense, perception, or normal intelligence
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(usually postpositive) stunned, dazed, or stupefied
stupid from lack of sleep
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having dull mental responses; slow-witted
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trivial, silly, or frivolous
noun
Usage
What are other ways to say stupid? The adjective stupid describes things characterized or proceeding from mental dullness. Do you know when to use stupid, fatuous, silly, inane, foolish, and asinine? Find out on Thesaurus.com.
Commonly Confused
Stupid, ignorant, and unintelligent are all used to refer to people or things that seem to show a lack of mental resources. Stupid is the most general and most insulting term, and can describe someone lacking in intelligence, wisdom, prudence, or mental quickness. Unintelligent refers to people or things that are lacking in capacity for learning, reasoning, or understanding. Ignorant, by contrast, generally means lacking in knowledge (not necessarily lacking in intelligence).
Related Words
See dull.
Other Word Forms
Etymology
Origin of stupid
First recorded in 1535–45; from Latin stupidus, equivalent to stup(ēre) “to be numb, to be stunned” + -idus -id 4 ( def. )
Explanation
A stupid person doesn’t have much intelligence or imagination, and they go through life making decisions that seem to lack all common sense. If you’ve got a brain but you don’t use it, you might be a bit stupid. The word comes from a Latin adjective that means “amazed or stunned,” and stupid people are stunned by everything because their minds are numb. You can make a stupid mistake when you’re not thinking, and you can call someone stupid if you’re feeling cruel, like “Hey, Stupid.” Zombies are stupid because their brains are dead. If that makes sense to you, then you’re not stupid, and you’re also not a zombie. Well done!
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Kerri Kenney-Silver, 56, is an actor and comedian known for the film “A Futile and Stupid Gesture” and TV’s “Reno 911!” and “Love.”
From The Wall Street Journal • May 26, 2026
One of his first successes was writing "Stupid Cupid" for one of the era's most popular US female vocalists, Connie Francis.
From Barron's • Feb. 28, 2026
When asked whether Delap deserved to be sent off, Maresca said: "Absolutely, yes. Stupid foul. We can avoid that."
From BBC • Oct. 29, 2025
Katelyn Doyle is the author of the contemporary rom-coms "Just Some Stupid Love Story" and "Total Dreamboat," and she also writes as the USA Today bestselling historical romance novelist Scarlett Peckham.
From Salon • Jul. 4, 2025
Stupid, I guess, because the answer was so obvious.
From "Endangered" by Eliot Schrefer
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
