[cheng2 xin1 cheng2 yi4] /earnestly and sincerely (idiom); with all sincerity/
  [cheng2 xin1 cheng2 yi4] /de tout coeur/de bonne foi/sincèrement/
 [せいしんせいい] /(adv,n,adj-no) in all sincerity/with one's whole heart/whole-hearted devotion/EntL1381190X/
Visszatérés a(z) „诚心诚意” laphoz.