believability(state or quality of being believable) noun [UK: bə.ˌli.və.ˈbɪ.lə.ti] [US: bə.ˌli.və.ˈbɪ.lə.ti]
credibility [credibilities](reputation impacting one's ability to be believed) noun [UK: ˌkre.dɪ.ˈbɪ.lɪ.ti] [US: ˌkre.də.ˈbɪ.lə.ti]He lost his credibility because he betrayed a friend. = Él perdió su credibilidad porque traicionó a un amigo.