ad. To an extent or in a way that cannot be, or could not have been, imagined
The Century Dictionary and Cyclopedia
In an unimaginable manner; inconceivably.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. to an unimaginable extent
Word Usage
"If we "assume the Big Bang" as if it were something that happened outside the bounds of reality, then we have a universe that, magically, begins fully wound-up, comprised of potential energy in unimaginably super-concentrated form."