Unknowable (adjective)

Not able to be known or understood.

Origin:

From un- (not) + knowable (capable of being known), from the verb "know".

Examples:

1. The mystery of the universe is unknowable.
2. The inner workings of the human mind are unknowable.
3. The ultimate cause of the universe is unknowable.
4. Many people believe that the nature of God is unknowable.
5. The complexity of the universe is unknowable.