'Credibly' definitions:

Definition of 'credibly'

From: WordNet
adverb
Easy to believe on the basis of available evidence; "he talked plausibly before the committee"; "he will probably win the election" [syn: credibly, believably, plausibly, probably] [ant: implausibly, improbably, incredibly, unbelievably]

Definition of 'Credibly'

From: GCIDE
  • Credibly \Cred"i*bly\, adv. In a manner inducing belief; as, I have been credibly informed of the event. [1913 Webster]