Jisho

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Adverb (fukushi), Adverb taking the 'to' particle
1. carefully; closely; attentively; profoundly; deeply; at lengthOnomatopoeic or mimetic word, Usually written using kana alone
Other forms
熟々 【つらつら】倩 【つらつら】熟 【つらつら】
Notes
倩々: Rarely-used kanji form. 熟々: Rarely-used kanji form. 倩: Rarely-used kanji form. 熟: Rarely-used kanji form.

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