adjective
1.
Synonyms: incomprehensible 1, impenetrable, incognizable, uncomprehensible, unfathomable, ungraspable, unintelligible
Antonyms: knowable
2.
Synonyms: inconceivable 1, incomprehensible, unimaginable, ununderstandable
Antonyms: knowable
3.
Synonyms: mysterious , arcane, cabalistic, impenetrable, inscrutable, mysterial, mystic, numinous, unexaminable, unguessed