"sincerely" in the adverb sense
1. sincerely, unfeignedly, truly
with sincerity without pretense
"she praised him sincerely for his victory"
"was unfeignedly glad to see his old teacher"
"we are truly sorry for the inconvenience"
2. sincerely, sincerely yours
written formula for ending a letter
Source: WordNet® (An amazing lexical database of English)
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