from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. unable to be imagined; inconceivable or mind-boggling; beyond belief
from The Century Dictionary and Cyclopedia
- Not imaginable; not capable of being imagined, conceived, or thought of; inconceivable.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. totally unlikely
From un- + imagine + -able. (Wiktionary)