Etymology
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stupidity (n.)

1540s, "want of intelligence," from Latin stupiditatem (nominative stupiditas) "dullness, stupidity, senselessness," from stupidus "confounded, amazed; dull, foolish" (see stupid). It also at various times meant "lack of feeling or emotion" (1560s); "stupor, numbness" (c. 1600).

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Definitions of stupidity

stupidity (n.)
a poor ability to understand or to profit from experience;
stupidity (n.)
a stupid mistake;
Synonyms: betise / folly / foolishness / imbecility
From wordnet.princeton.edu