Synonyms of surely

1 Syllable

yep, yes, cert

2 Syllables

staunchly, deeply, really, doubtless, okker, roger, strictly, plainly, okay, indeed, clearly, truly

3 Syllables

trustfully, trustingly, visibly, verily, mournfully, movingly, audibly, seemingly, doubtlessly, overtly, certainly, easily, stringently, reliably, obviously, fixedly, distinctly

4 Syllables

assuredly, sanguinely, reputedly, confirmedly, presumably, affectingly, evidently, undeniably, unerringly, unfailingly, undoubtedly, unshakably, manifestly, admittedly, hopefully, transparently, sonorously, infallibly, decidedly, explicitly

5 Syllables

decisively, conclusively, unambiguously, absolutely, incontestably, posolutely, unquestionably, indubitably, positively, unmistakably, recognizably, penetratingly, authentically, inexorably, unimpeachably, definitely, inevitably, irrefutably

6 Syllables

unequivocally, categorically