MeanOF

doubtless

- adverb (adv)

Meaning: certainly most likely

Synonyms: absolutely apparently assuredly clearly easily for sure indisputably no ifs ands or buts of course ostensibly positively precisely presumably probably seemingly supposedly surely truly undoubtedly unequivocally unquestionably without doubt
Antonyms: doubted doubtedly dubious improbably questionable uncertain unlikely

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.