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probably (adv.)

mid-15c., probabli, "plausibly, in all likelihood, in a way that seems likely to prove true," from probable + -ly (2). As a general purpose qualifier, "so far as the evidence goes," 1610s.

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Definitions of probably from WordNet

probably (adv.)
with considerable certainty; without much doubt;
He is probably out of the country
Synonyms: likely / in all likelihood / in all probability / belike
probably (adv.)
easy to believe on the basis of available evidence;
he will probably win the election
Synonyms: credibly / believably / plausibly
From wordnet.princeton.edu