ad. Used to note the surprising or hard-to-believe nature of what is being said and suggest that it is nevertheless true.
the GNU version of the Collaborative International Dictionary of English
ad. In an incredible manner.
The Century Dictionary and Cyclopedia
In an incredible manner; in a manner to preclude belief.
Beyond prior belief or conception; unimaginably; inconceivably.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. exceedingly; extremely
ad. not easy to believe
Word Usage
"In summation, disability is an incredibly complex subject and I'm sure everyone has a different opinion on the language that should be used to describe it, but it's * incredibly* refreshing to read posts that take this issue so seriously."