Akademik

foolishness
noun
1. the trait of acting stupidly or rashly (Freq. 2)
Syn: ↑folly, ↑unwiseness
Ant: ↑wisdom (for: ↑folly)
Derivationally related forms: ↑unwise (for: ↑unwiseness), ↑foolish
Hypernyms: ↑trait
Hyponyms:
indiscretion, ↑injudiciousness, ↑absurdity, ↑fatuity, ↑fatuousness, ↑silliness, ↑asininity
2. the quality of being rash and foolish
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trying to drive through a blizzard is the height of folly

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adjusting to an insane society is total foolishness

Syn: ↑folly, ↑craziness, ↑madness
Derivationally related forms: ↑mad (for: ↑madness), ↑foolish, ↑crazy (for: ↑craziness)
Hypernyms: ↑stupidity
3. a stupid mistake
Syn: ↑stupidity, ↑betise, ↑folly, ↑imbecility
Hypernyms: ↑mistake, ↑error, ↑fault

Useful english dictionary. 2012.