Jisho

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Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no'
1. sudden; abrupt; unexpected; immediate​Usually written using kana alone, occ. written 遽か
Prefix, Na-adjective (keiyodoshi)
2. improvised; hasty; impromptu; offhand​Usually written using kana alone
Noun
3. impromptu skit​Abbreviation, See also 俄狂言, occ. written 仁輪加 or 仁和加
Noun
4. bandwagon fan; fair-weather fan​Abbreviation, Slang, Usually written using kana alone, See also にわかファン
Other forms
俄か 【にわか】

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