Jisho

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Noun, Noun which may take the genitive case particle 'no'
1. madness; madmanSensitive, Usually written using kana alone
Noun, Noun which may take the genitive case particle 'no'
2. enthusiast; freak; junkieUsually written using kana alone
Other forms
気狂い 【きちがい】基地外 【きちがい】既知外 【きちがい】キチガイ
Notes
基地外: Irregular kanji usage. 既知外: Irregular kanji usage.

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