from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. In a manner that one does not believe.
- adv. To an extent not to be believed.
- adv. Contrary to expectations, amazingly.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adv. in an unbelievable manner
- adv. not easy to believe
unbelievable + -ly (Wiktionary)