definition of
foolishness

[1] #1 foolishness n. [folly, unwiseness] the trait of acting stupidly or rashly. wn

[2] #2 foolishness n. [folly, 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". wn

[3] #3 foolishness n. [stupidity, betise, folly, imbecility] a stupid mistake. wn