sincere

形容词 sincere:

1. open and genuine; not deceitful
2. characterized by a firm and humorless belief in the validity of your opinions
   同义词：earnest, solemn

1. How can I persuade you that I am sincere?
   怎样才能使你相信我是真心实意的呢?
2. I think he is sincere and quite without affectation.
   我认为他为人诚挚，毫不做作。
3. Sincere congratulations on your son wedding please convey our best wish.
   令郎喜结良缘谨此致以诚挚的祝贺并请转达最美好的祝愿。
4. Please accept my sincere thanks and best wishes.
   请接受我诚挚的感谢和最美好的祝愿。
5. Please accept our sincere apologies for the error in your bank statement.
   为你的银行报表中的错误，请接受我们诚挚的道歉。
6. Please give my sincere regards to all the members of your family.
   请向你全家转达我真挚的问候。