Synonyms for probably:
likely to happen (adverb)
possibly, in all likelihood, believably, plausibly, presumably, in all probability.
possibly, hopefully, aptly, plausibly, presumably, likely.
reliably, inevitable, predestined, fated, potential, potentially, preordained, imminent, credible, self-fulfilling, expected, supposedly, inevitably, odds-on, prospective.
pending, easily, destined, necessary, probable, guaranteed.
Other synonyms and related words:
good, believably, pending, credible, bound, hopefully, belike, credibly, potentially, potential, in all likelihood, in all probability, reliably, predestined, prospective, imminent, necessary, guaranteed, probable, certain, theoretically, easily, fated.
in theory (adverb)
presumably, likely, aptly, plausibly, possibly.
Sense 1 (noun)
bound, sure, good, expected, probable, guaranteed, certain.
believably, plausibly, in all likelihood, credibly, likely, in all probability, belike.