from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Impossible to know, especially being beyond the range of human experience or understanding: the unknowable mysteries of life.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Not knowable.
- n. Something that cannot be known.
from The Century Dictionary and Cyclopedia
- Incapable of being known; not capable of being ascertained or discovered; above or beyond knowledge.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. not knowable
From un- + know + -able. (Wiktionary)