Folly

n.	1.	The state of being foolish; want of good sense; levity, weakness, or derangement of mind.
	2.	A foolish act; an inconsiderate or thoughtless procedure; weak or light-minded conduct; foolery. What folly 'tis to hazard life for ill. - Shak.
	3.	Scandalous crime; sin; specifically, as applied to a woman, wantonness. [Achan] wrought folly in Israel. - Josh. vii. 15. When lovely woman stoops to folly. - Goldsmith.
	4.	The result of a foolish action or enterprise. It is called this man's or that man's "folly," and name of the foolish builder is thus kept alive for long after years. - Trench.

Noun	1.	folly - the trait of acting stupidly or rashly Synonyms: foolishness, unwiseness Antonyms: wisdom, wiseness - the trait of utilizing knowledge and experience with common sense and insight
	2.	folly - a stupid mistake Synonyms: betise, imbecility, stupidity, foolishness
	3.	folly - the quality of being rash and foolish Synonyms: craziness, foolishness
	4.	folly - foolish or senseless behavior Synonyms: foolery, tomfoolery, lunacy, craziness, indulgence

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, frivolity, frivolousness, gaffe, giddiness, goof, goofiness, idiocy, inanity, ineptitude, insanity, irrationality, kookiness, lunacy, madness, mindlessness, mistake, niaiserie, nonsense, nugacity, nuttiness, obtuseness, preposterousness, queerness, rashness, sappiness, screwiness, senselessness, sottise, stolidity, stolidness, stupid thing, thoughtlessness, triflingness, triviality, unwise step, wackiness, weak-mindedness, weirdness, witlessness, zaniness, zanyism