- doubtless as a adverb:
Without doubt; certainly.
Roget 474: certainly etc. adj.; for certain, certes [Lat.], sure, no doubt, doubtless, and no mistake, flagrante delicto [Lat.], sure enough, to be sure, of course, as a matter of course, ... show more
Moby thesaurus: absolutely, admittedly, assumably, assured, believing, beyond doubt, beyond question, by all odds, certain, certainly, confident, convinced, definitely, devout, dogmatic, dollars to doughnuts, doubtlessly, faithful, fideistic, for certain ... show more.
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