adjective
1.
Synonyms: inconceivable 1, incomprehensible, unknowable, ununderstandable
Antonyms: imaginable
2.
Synonyms: exceptional 1, extraordinary, rare, singular, uncommon, unique, unordinary, unthinkable, unusual, unwonted
3.
Synonyms: incredible 1, incogitable, inconceivable, insupposable, unbelievable, unthinkable