probably in WordNet English dictionary

1. easy to believe on the basis of available evidence
   "he talked plausibly before the committee"; "he will probably win the election"
   credibly  believably  plausibly  probably  credibly  believably  plausibly  probably 
   
2. with considerable certainty; without much doubt
   "He is probably out of the country"; "in all likelihood we are headed for war"
   probably  likely  in all likelihood  in all probability  belike  probably  likely  in all likelihood  in all probability  belike