1. (n.) The state of being foolish; want of good sense; levity, weakness, or derangement of mind.

2. (n.) A foolish act; an inconsiderate or thoughtless procedure; weak or light-minded conduct; foolery.

3. (n.) Scandalous crime; sin; specifically, as applied to a woman, wantonness.

4. (n.) The result of a foolish action or enterprise.

absurdity absurdness act of folly asininity battiness blunder brainlessness buffoonery clownishness crackpottedness crankiness craziness daffiness daftness desipience dottiness dumb trick dumbness eccentricity error fatuity fatuousness faux pas fluff foolery foolheadedness foolishness frivolity frivolousness gaffe giddiness goof goofiness idiocy imbecility imprudence inanity indiscretion ineptitude insanity irrationality kookiness lunacy madness mindlessness mistake niaiserie nonsense nugacity nuttiness obtuseness preposterousness queerness rashness sappiness screwiness senselessness silliness sottise stolidity stolidness stupid thing stupidity thoughtlessness triflingness triviality unwise step wackiness weak-mindedness weirdness witlessness zaniness zanyism