Jisho

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'taru' adjective, Adverb taking the 'to' particle
1. merry; joyful; gleeful​
Other forms
嬉嬉 【きき】、喜々 【きき】、喜喜 【きき】、嘻々 【きき】、嘻嘻 【きき】
Notes
嘻々: Rarely-used kanji form. 嘻嘻: Rarely-used kanji form.

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