/un noh"euh beuhl/ , adj.
1. not knowable; incapable of being known or understood.
n.
2. something that is unknowable.
3. the Unknowable , the postulated reality lying behind all phenomena but not cognizable by any of the processes by which the mind cognizes phenomenal objects.
[ 1325-75; ME; see UN- 1 , KNOWABLE ]