JMdict: 1381190

誠心誠意 【せいしんせいい】

  1. [adv,n,adj-no] in all sincerity; with one's whole heart; whole-hearted devotion
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
誠 Sincerity, Admonish, Warn, Prohibit, Truth, Fidelity セイ まこと
心 Heart, Mind, Spirit, Heart Radical (no. 61) シン こころ, -ごころ
意 Idea, Mind, Heart, Taste, Thought, Desire, Care, Liking イ