"frankly" in the adverb sense
1. honestly, candidly, frankly
used as intensives reflecting the speaker's attitude) it is sincerely the case that
"honestly, I don't believe it"
"candidly, I think she doesn't have a conscience"
"frankly, my dear, I don't give a damn"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License