Synonyms for definitely

absolutely, affirmatively, assuredly, certainly, conclusively, decidedly, definitively, doubtless, doubtlessly, emphatically, flat-out, for sure, incontestably, incontestably., incontrovertibly, indeed, indisputably, indubitably, irrefutably, noticeably, of course, positively, surely, uh-huh, unambiguously, unarguably, unavoidably, undeniably, undoubtably, undoubtedly, unequivocally, unmistakeably, unquestionably, unquestioningly, veritably, without question, yea, yeah, yep, yes