Jisho

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'taru' adjective, Adverb taking the 'to' particle
1. dumbfounded; overcome with surprise; in blank amazement; in a daze
Other forms
茫然 【ぼうぜん】ぼう然 【ぼうぜん】惘然 【ぼうぜん】惘然 【もうぜん】ボーゼン

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