What does ‘sincerely’ mean?

Sincerely is an adverb meaning ‘genuinely’ or ‘honestly’. It’s related to the adjective ‘sincere’. It’s commonly used on its own or in combination with ‘yours’ as a sign-off at the end of an email message or letter. It’s a formal way of ending a message that emphasises your honest intentions toward the recipient.

It’s also used in other contexts to emphasise the genuineness of a feeling (e.g., ‘I am sincerely sorry for my comments’).