The only free and comprehensive online etymological dictionary of the Spanish language
creíble (Adjective) "believable"
13th cent. From Latin credibilis 'id.,' from credere "to believe" (see creer).
Indo-European
Romance
Portuguese crível, credível, Catalan creïble, French crédible, Italian credibile, Romanian credibil
Celtic
Old Irish creitid "to believe," Middle Welsh credu 'id.,' Middle Breton crediff 'id.,' Cornish cresy 'id.'