Pocket Thesaurus
Antonyms of probably
doubtless, presumably, perhaps, possibly, apparently, dollars to doughnuts, maybe, reasonably, perchance, seemingly, no doubt, plausibly, believably, as likely as not, as the case may be, expediently, feasibly, imaginably, in all likelihood, in all probability, like enough, most likely, one can assume, practicably, presumptively, to all appearances
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