sincerely · adverb /sɪnˈsɪr.li/
Sincerely (yours)
B1 used at the end of a letter or e-mail to someone who is not a friend or family member
Dictionary examples:
Sincerely yours, Eleanore Mera
Sincerely, Drew Gimbal
Learner example:
Thanks For your attention. Sincerely, (First Certificate in English; B2; Spanish)
sincerely
C1 in a sincere way
Dictionary example:
I sincerely hope this never happens again.
Learner example:
I sincerely hope that you improve your services. (Certificate in Advanced English; C1; Portuguese)