also: きちげぇ
Saying something like that is crazy (literally: seems like madness).
彼は怒ると手がつけられないきちがいになる。
When he gets angry, he turns into an uncontrollable madman.
mania; craze; obsession; enthusiast; fanatic
Used as a suffix or standalone noun to indicate an extreme obsession or enthusiast. Often derogatory or self-deprecating, e.g., 釣りきちがい (fishing nut). Less sensitive than sense 1 but still informal and potentially offensive.
彼は筋トレきちがいで、毎日ジムに通っている。
He's a workout fanatic and goes to the gym every day.
あの人はゲームきちがいだから、話が合うよ。
That person is a game maniac, so you'll get along.
He's a fishing nut and goes to the river every weekend.
He kept working like a madman.
狂気 refers neutrally to the state of madness or insanity itself, whereas 気違い is a derogatory label for a person and carries strong insult force.
基地 (as slang) is a softened, joking suffix meaning 'fanatic', while 気違い is the blunt, offensive original word for 'crazy person' that it comes from.
キチ is a clipped, somewhat softened slang suffix derived from 気違い, which is the full word literally meaning 'crazy person' and is far more offensive.
sexual maniac; sex fiend
fickle weather; unpredictable weather
insane behavior; madness
look mad; act crazy; seem insane
Katakana spelling; often used for emphasis or in informal writing. This is a priority reading.
Search-only kanji form; not a standard spelling.
Irregular kanji usage; a non-standard phonetic substitution. Included for search coverage only.
Irregular kanji usage; a non-standard phonetic substitution. Included for search coverage only.