(of a performance, performer, new design etc) wonderful; excellent
amazing, wonderful
wild and strange; impossible to carry out
strange, different; imaginary
not plausible
not likely
not likely to be true or to happen
not likely
that cannot be imagined
beyond reason, belief
(almost) impossible to believe (because shocking); very surprising
beyond belief
that cannot be defined or put in words
unspeakable
that cannot be put into words
unspeakable
hidden; not clearly seen; not easily understood; not well known
not easily understood
completely impossible or ridiculous
ridiculous, bizarre
deserving to be laughed at; foolish
stupid, funny
to have an idea or feeling concerning the possibility or truth of (something); doubtful; possibly not true; a person suspected of doing wrong etc
doubtful
not convincing
not convincing
without an equal
unique, obscure
that cannot be imagined
mind-boggling
not likely to happen or be true
not probable
imaginary; not real
fake, make-believe; hypothetical
that cannot be expressed or described in words
very bad; beyond description
not to be considered
incredible, unusual