[stoo-pid, styoo]
adjective, stupider, stupidest.
lacking ordinary quickness and keenness of mind; dull.
characterized by or proceeding from mental dullness; foolish; senseless: a stupid question.
tediously dull, especially due to lack of meaning or sense; inane; pointless: a stupid party.
annoying or irritating; troublesome: Turn off that stupid radio.
in a state of stupor; stupefied: stupid from fatigue.
Slang. excellent; terrific.
Informal. a stupid person.

1535–45; < Latin stupidus = stup(ēre) to be numb or stunned + -idus -id4

stupidly, adverb
stupidness, noun
unstupid, adjective
unstupidly, adverb
unstupidness, noun

ignorant, stupid. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stupid (ˈstjuːpɪd)
1.  lacking in common sense, perception, or normal intelligence
2.  (usually postpositive) stunned, dazed, or stupefied: stupid from lack of sleep
3.  having dull mental responses; slow-witted
4.  trivial, silly, or frivolous
5.  informal a stupid person
[C16: from French stupide, from Latin stupidus silly, from stupēre to be amazed]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1540s, "mentally slow," from M.Fr. stupide, from L. stupidus "amazed, confounded," lit. "struck senseless," from stupere "be stunned, amazed, confounded," from PIE *(s)tupe- "hit," from base *(s)teu- (see steep (adj.)). Native words for this idea include negative compounds
with words for "wise" (cf. O.E. unwis, unsnotor, ungleaw), also dol (from root of Ger. toll "mad," related to Gk. tholeros "muddy, turbid"), and dysig (see dizzy). Stupid retained its association with stupor and its overtones of "stunned by surprise, grief, etc." into mid-18c. The difference between stupid and the less opprobrious foolish roughly parallels that of Ger. töricht vs. dumm but does not exist in most European languages.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for stupid
Impressed by the craftsmanship, she begins to hate her stupid costume.
She thinks summer looks amazing and begins to hate her stupid comic book.
They were renowned by the ancient arabs for being unnaturally stupid.
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