Of unsound mind; insane, demented. / Out of control. / Very excited or enthusiastic. / In love; experiencing romantic feelings. / (informal) Very unexpected; wildly surprising.

(slang) Very, extremely.

(slang, countable) An insane or eccentric person; a crackpot. / (slang, uncountable) Eccentric behaviour; lunacy.

plural of craziness

(uncountable) The state of being crazy; madness; derangement / (archaic, uncountable) The state of being broken down or weakened / (countable) The result or product of being crazy.

plural of crazy

A thin, flexible sheet of plastic ridden down snowy hills for recreation (akin to a toboggan).

(informal) Having a great romantic or sexual attraction to boys of one's age group.

(card games) A card game in which players try to rid themselves of their cards by playing a matching rank or suit on the previous card played, having to draw an additional card if unable to do this; a player who plays an eight can dictate the suit to be played next.

(slang) very crazy