adv. 25B6; adverb IN ALL LIKELIHOOD, in all probability, as like(ly) as not, (very/most) likely, ten to one, the chances are, doubtless, no doubt; archaic like enough.
PROBABLY
Meaning of PROBABLY in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012