Stupid Definition

sto͝opĭd, styo͝o-
stupidest, stupider
adjective
stupidest, stupider
Slow to learn or understand; obtuse.
American Heritage
Tending to make poor decisions or careless mistakes.
American Heritage
Lacking normal intelligence or understanding; slow-witted; dull.
Webster's New World
In a state of stupor; dazed; stunned; stupefied.
Webster's New World
Showing or resulting from a lack of normal intelligence; foolish; irrational.
A stupid idea.
Webster's New World
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noun
A stupid person.
Webster's New World
Synonyms:
adverb
(slang, dated) Extremely.
My gear is stupid fly.
Wiktionary

Other Word Forms of Stupid

Noun

Singular:
stupid
Plural:
stupids

Adjective

Base Form:
stupid
Comparative:
stupider
Superlative:
stupidest

Origin of Stupid

  • From Middle French stupide, from Latin stupidus (“struck senseless, amazed"), from stupeō (“be amazed or confounded, be struck senseless"), from Proto-Indo-European *(s)tup- (“to wonder"), from Proto-Indo-European *(s)tu- (“to stand, stay"). Cognate with Old High German stubarōn (“to be astonished, be stunned, be blocked"). Related also to Old English stoppian (“to block, stop"). See stop.

    From Wiktionary

  • Latin stupidus from stupēre to be stunned

    From American Heritage Dictionary of the English Language, 5th Edition

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