Jisho

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'taru' adjective, Adverb taking the 'to' particle
1. lively; vigorous; sprightly; animated; vivid​Usually written using kana alone
Other forms
溌溂 【はつらつ】、蹳剌 【はつらつ】、ハツラツ
Notes
溌溂: Rarely-used kanji form. 蹳剌: Rarely-used kanji form.

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