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folly

noun

1.

the trait of acting stupidly or rashly

boneheadedness stuntness unwisdom foolishness unwiseness

Antonym:

2.

a stupid mistake

betise foolishness imbecility stupidity

3.

the quality of being rash and foolish

craziness foolishness madness

4.

foolish or senseless behavior

sotship unwit craziness foolery indulgence lunacy tomfoolery