せいしんせいい
Readings
彼は誠心誠意、彼女に尽くした。
He devoted himself whole-heartedly to her.
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Context: 誠心誠意 (せいしんせいい)
Current word
誠心誠意せいしんせいい
in all sincerity; with one's whole heart; whole-hearted devotion
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