believably adv 1: in a believable manner; "he acted believably sincere" [ant: {implausibly}, {improbably}, {incredibly}, {unbelievably}] 2: 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}]