sincerely
adverb uk/sɪnˈsɪə.li/ us/sɪnˈsɪr.li/
真诚地，诚实地
honestly and without pretending or lying
I'm sincerely grateful. 我衷心地感谢。
(yours) sincerelyB1 (US also Sincerely yours) 谨启（用于信的结尾）
used to end a formal letter that is sent to a particular person