Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Slow to learn or understand; obtuse.
- adj. Tending to make poor decisions or careless mistakes.
- adj. Marked by a lack of intelligence or care; foolish or careless: a stupid mistake.
- adj. Dazed, stunned, or stupefied.
- adj. Pointless; worthless: a stupid job.
- n. A stupid or foolish person.
Century Dictionary and Cyclopedia
- In a state of stupor; having the faculties deadened or dulled; stupefied, either permanently or temporarily; benumbed.
- Lacking ordinary activity of mind; dull in ideas or expression; slow-witted; obtuse; crass.
- Characterized by mental dullness or inanity; witless; senseless; foolish; inane: as, a stupid joke; a stupid book; stupid fears.
- Synonyms Heavy, dull, drowsy, lethargic, comatose, torpid.
- Muddy-brained, muddled.
- Silly, Foolish, etc. (see absurd); flat, tame, humdrum, pointless, prosaic. See list under foolish.
- n. A stupid or humdrum person; a blockhead; a dunce.
Wiktionary
- adj. Lacking in intelligence or exhibiting the quality of having been done by someone lacking in intelligence.
- adj. To the point of stupor.
- adj. Characterized by or in a state of stupor; paralysed.
- adj. Lacking sensation; inanimate; destitute of consciousness; insensate.
- adj. Amazing.
- adj. Dangerous, obstructive.
- adv. Extremely.
- n. A stupid person; a fool.
GNU Webster's 1913
- adj. Very dull; insensible; senseless; wanting in understanding; heavy; sluggish; in a state of stupor; -- said of persons.
- adj. Resulting from, or evincing, stupidity; formed without skill or genius; dull; heavy; -- said of things.
WordNet 3.0
- adj. in a state of mental numbness especially as resulting from shock
- adj. lacking or marked by lack of intellectual acuity
- adj. lacking intelligence
- n. a person who is not very bright
Etymologies
- Latin stupidus, from stupēre, to be stunned.
Examples
“Oh, Harvey, stupid, _stupid_ -- the video monitors on the deck -- Ben must have given her a gun, _knowing_ she would someday use it --”
Asimov's Science Fiction
“I personally * hate hate hate* when I feel like doing stuff that I know is * stupid stupid stupid*.”
“And you don’t see that much difference between men’s and women’s uniforms in fencing where it would be stupid, *stupid* to leave the body unprotected or the rest of martial arts that don’t hinge on gripping the opponent’s clothes like karate or taekwondo.”
“Heh…rachel’s comments were so stupid, they infected me and made me misspell ’stupid’.”
Think Progress » Bush: I’m Sending More Troops To Iraq No Matter What Congress Does
“Being stupid doesn’t mean you deserve to have bad things happen to you, yet often people have no compassion for someone if they can just call that person ’stupid’.”
“NONE of these fascist dictators have ever put on a uniform. for them to sit and say it was a blow to the military shows how stupid they really are. why would anyone expect ’stupid’ to understand what hekerry was saying. if anyone owes an apology it is this criminal, hypocritical nazi admin. for invading, occupying and murdering thousands of innocent people for their own self interests. and all in the name of OIL.”
Think Progress » Kerry Says ‘I’m Sorry’ on MSNBC, Snow Still Claiming He Hasn’t Apologized
“He has suspensions … I use the term stupid because a lot of suspensions are … every now and then you have to do something stupid to create some space for yourself for other players to be a little hesitant when they come around you.”
“The term stupid simply meant "think" in the context of you actual remarks, and was aimed at the reader not you.”
“Nevertheless, since God decided to give humans “free will,” He has been nothing but surprised by the unseemly and His Word stupid way people have used this license to veer from divine sensibilities.”
“MSNBC viewers take the term "stupid" to a whole new level.”
Lists
These user-created lists contain the word ‘stupid’.
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Headlines & Newsmakers
frugality, environment, extinction, bible, killer, jazz, cloning, dead, god, moon, global warming, bailout and 338 more...
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The Pain of Texting
Words that are a pain in the ass to type in on a numerical keypad on a cell phone because they have consecutive letters that share the same button:
2 - ABC
3 - DEF
4 - GHI...defcon, hi, no, attitude, xylophone, on, monday, monkey, mono, dig, back, babble and 212 more...
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Describing People
eye, hair, mouth, nose, tooth, head, face, arm, hand, finger, lip, leg and 212 more...
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Adjectives
sagacious, average, angry, mad, crazy, giant, ugly, pretty, happy, sad, lonely, solitary and 119 more...
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Just not to bright
words describing people or things that just aren't very intelligent
galah, idiot, simpleton, dufus, dummy, stupid, moron, moronic, idiocy, dimwit, special, on the short bus and 8 more...
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Words that Make Me Cry
geek, nerd, wishywashy, freak, issue, ticktock, school, university, uni, work, task, homework and 12 more...
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Words in which "u" is pronounced "yu"
cute, uniform, puny, municipal, butte, fume, perfume, puke, cucumber, huge, demure, cube and 56 more...
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Mr. Pronunciation's Bad Day
Mr. Pronunciation is an upstanding and reliable sort of dude. He's like the Clark Kent of the pronunciation world. Sometimes, though, he botches up a pronunciation and, you know, he's in a hurry an...
colonel, treacle, cruel, laissez faire, poo, stupid, sashay, concrete, birthmark, chic, draught, gaur and 11 more...
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words i should never use
...and yet still do
ghost ride the whip, should, stupid, ain't, like, can't, moron

PossibleUnderscore The next day, at the usual hour, Marius took from his closet his new coat, new pantaloons, his new hat, and his new boots; he dressed himself in panoply complete, put on his gloves, prodigious prodigality, and went to the Luxembourg.
On the way, he met Courfeyrac, and pretended not to see him. Courfeyrac, on his return home, said to his friends: "I have just met Marius' new hat and coat, with Marius inside. Probably he was going to an examination. He looked stupid enough."
-Les Miserables, Victor Hugo Jan 3, 2010