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foolishness (n.)

late 15c., "quality of being foolish," from foolish + -ness. From 1530s as "a foolish practice."

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Definitions of foolishness from WordNet

foolishness (n.)
the trait of acting stupidly or rashly;
Synonyms: folly / unwiseness
foolishness (n.)
the quality of being rash and foolish;
adjusting to an insane society is total foolishness
Synonyms: folly / craziness / madness
foolishness (n.)
a stupid mistake;
Synonyms: stupidity / betise / folly / imbecility
From wordnet.princeton.edu