Synonyms of believable

1 Syllable
straight, tried
2 Syllables
truthful, trusty
3 Syllables
truth-telling, credible, reliable, palpable, tenable, credential, possible, satisfying, rational, plausible, authentic, convincing, trustworthy, probable, arguable, truthtelling, likely
4 Syllables
acceptable, defendable, aboveboard, colorable, reasonable, creditable, conceivable, assertable, maintainable, presumptive, impressive, honest-to-god, persuasive, presumable, supposable, fiduciary
5 Syllables
unquestionable, imaginable