believability, believableness, noun
believable, adjective
believably, adverb
believer, noun
believingly, adverb
half-believed, adjective
half-believing, adjective
prebelieve, verb, prebelieved, prebelieving.
prebeliever, noun
superbelievable, adjective
superbelievableness, noun
superbelievably, adverb
well-believed, adjective