adj. 25B6; adjective INCREDIBLE, beyond belief, inconceivable, unthinkable, unimaginable; unconvincing, far-fetched, implausible, improbable; informal hard to swallow.
credible.
UNBELIEVABLE
Meaning of UNBELIEVABLE in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012