perhaps, possibly, can be, might be, could be, maybe so, mayhap, as it may be, conceivable, credible, feasible, obtainable, wind and weather permitting, in the cards*, God willing.
Antonyms hardly*, scarcely, probably not.
"maybe." YourDictionary, n.d. Web. 10 February 2019. <https://thesaurus.yourdictionary.com/Maybe>.
maybe. (n.d.). Retrieved February 10th, 2019, from https://thesaurus.yourdictionary.com/Maybe
Possibly but not certainly:
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