Bedeutung von “sincerely” — Learner’s Dictionary

sincerely

adverb us uk /sɪnˈsɪəli/

in a sincere way:

I sincerely hope that this never happens again.
Yours sincerely formal

B1 used at the end of formal letters when you know the name of the person you are writing to

(Definition von “sincerely” aus dem Cambridge Learner's Dictionary © Cambridge University Press)