Usage Note
Sincèrement is used both as a sentence adverb ('Sincerely, I think...') and as a letter closing (Sincèrement vôtre). It is formed regularly from the adjective sincère + -ment. In speech, it can introduce an honest opinion the speaker wants to flag as candid.
Examples
"Je vous remercie sincèrement de votre aide."
Natural Translation
I sincerely thank you for your help.

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