狂人|きょうじんkyoujin[0]heiban (flat)

1. no-adjectivelunatic; madman
   その囚人しゅうじん達たちはまるで狂人きょうじんのように互たがいに争あらそった。↗

   The prisoners fought one another like so many mad people.

• SynonymキチガイCasualColloquial word for a madman; considered discriminatory, and the media generally avoid it. Also used for a person obsessed with something, an enthusiast.
• Synonym狂者きょうしゃWrittenA written, literary word, rarer and more archaic in flavor than 「狂人」. Can also mean someone obsessed with the refined arts. Not for everyday speech.
• Relatedキ印キじるしCasualA veiled, colloquial way of saying madman, but still a slur; rare and best avoided altogether.

For a madman in written or literary prose, use 「狂人」, as in Lu Xun's 「狂人日記」. The colloquial 「気違い」 is discriminatory and should be avoided, as should the slur 「キ印」; in medical contexts say 「精神疾患のある人」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 気きが狂くるった人ひと。