adj. Astonishingly great or large; huge; enormous.
adj. Of stunning volume, degree, or excellence; marvelous.
the GNU version of the Collaborative International Dictionary of English
adj. Astonishing; wonderful; amazing; especially, astonishing in magnitude or elevation.
The Century Dictionary and Cyclopedia
Causing stupor or astonishment; astounding; amazing; specifically, astonishing from greatness in extent or degree; of wonderful magnitude; immense; prodigious: as, a stupendous work of nature or art; a stupendous blunder.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. so great in size or force or extent as to elicit awe
Word Usage
"So stupendous is the potential, it could transform global energy politics and economics."