unimaginable
/ˌʌnɪˈmædʒɪnəbl/If you describe something as unimaginable, you are emphasizing that it is difficult to imagine or understand well, because it is not part of people's normal experience. 难以想像的
adjective [原级] 不可思议的；难以想像的
Conditions in prisons out there are unimaginably bad. 那里各监狱的条件难以想像地恶劣。
(beyond belief)
