Jisho

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Adverb (fukushi)
1. well; properly; skillfullyUsually written using kana alone, See also 良く
Adverb (fukushi)
2. oftenSee also 良く
Adverb (fukushi)
3. how (could you); why (would you)expressing incredulousness, sarcasm, disapproval, etc.
Other forms
善う 【よう】能う 【よう】よー

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