adj. 25B6; adjective UNTHINKABLE, inconceivable, incredible, unbelievable, unheard of, unthought of, untold, undreamed of, beyond one's wildest dreams.
UNIMAGINABLE
Meaning of UNIMAGINABLE in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012