Synonyms of probably

2 Syllables

perhaps, doubtless, maybe

3 Syllables

credible, feasibly, perchance, seemingly, contingent, doubtlessly, speciously, plausibly, possibly, reliably

4 Syllables

presumably, supposedly, reasonably, believably, assumably, expediently, practicably, potentially, apparently

5 Syllables

presumptively, imaginably, peradventure, theoretically, ostensively

6 Syllables

suppositionally