Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun foolishness

3 senses of foolishness

Sense 1
folly, foolishness, unwiseness -- (the trait of acting stupidly or rashly)
       => trait -- (a distinguishing feature of your personal nature)

Sense 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")
       => stupidity -- (a poor ability to understand or to profit from experience)

Sense 3
stupidity, betise, folly, foolishness, imbecility -- (a stupid mistake)
       => mistake, error, fault -- (a wrong action attributable to bad judgment or ignorance or inattention; "he made a bad mistake"; "she was quick to point out my errors"; "I could understand his English in spite of his grammatical faults")