1) Believably 2) Convincingly 3) Faithfully 4) In a plausible manner 5) In a plausible way 6) Plausibly 7) Probably 8) Realistically 9) Truly 1) Believably 2) Convincingly 3) Plausibly 4) Possibly 5) Reasonably 
• (adv.) In a manner inducing belief; as, I have been credibly informed of the event.
Cred'i·bly adverb In a manner inducing belief; as, I have been credibly informed of the event. 
[adv] - easy to believe on the basis of available evidence
credibly In a credible manner; so as to be believed; on trustworthy authority.
believably 3 plausibly adverb easy to believe on the basis of available evidence; `he talked plausibly before the committee`; `he will probably win the election`