"foolishness" in the noun sense
1. folly, foolishness, unwiseness
the trait of acting stupidly or rashly
2. folly, foolishness, craziness, madness
the quality of being rash and foolish
"trying to drive through a blizzard is the height of folly"
"adjusting to an insane society is total foolishness"
3. stupidity, betise, folly, foolishness, imbecility
a stupid mistake
Source: WordNet® (An amazing lexical database of English)
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