Jisho

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Adverb (fukushi), Adverb taking the 'to' particle, Suru verb
1. busily; sedulously; laboriously; feverishly; fussily; worrying (about little things)​Usually written using kana alone
Other forms
齷齪 【あくさく】、偓促 【あくせく】、偓促 【あくさく】
Notes
偓促: Rarely-used kanji form. 偓促: Rarely-used kanji form.

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