- not knowable; incapable of being known or understood.
- something that is unknowable.
- the Unknowable, the postulated reality lying behind all phenomena but not cognizable by any of the processes by which the mind cognizes phenomenal objects.
- incapable of being known or understood
- beyond human understanding
- (as noun)the unknowable
- the Unknowable philosophy the ultimate reality that underlies all phenomena but cannot be known