ad. In an incontrovertible manner; in a manner not capable of being denied, challenged, or disputed.
The Century Dictionary and Cyclopedia
In an incontrovertible manner.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. in an obvious and provable manner
Word Usage
"In fact, I learned from Bear Grylls (I assume that television shows remain incontrovertibly educational?) that we can survive in the harshest environments for so long as we have a canteen, shoelaces, socks and a camera crew."