Jisho

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Adverb (fukushi), Adverb taking the 'to' particle
1. deeply; keenly; severely; completely; utterlyUsually written using kana alone, Onomatopoeic or mimetic word
Adverb (fukushi), Adverb taking the 'to' particle
2. intently; carefully; closely; attentivelyUsually written using kana alone, Onomatopoeic or mimetic word
Other forms
熟 【つくつく】熟熟 【つくづく】熟熟 【つくつく】熟々 【つくづく】熟々 【つくつく】
Notes
熟: Rarely-used kanji form. 熟: Rarely-used kanji form. 熟熟: Rarely-used kanji form. 熟熟: Rarely-used kanji form. 熟々: Rarely-used kanji form. 熟々: Rarely-used kanji form.

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