from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of astounding force, volume, degree, or excellence; marvelous.
- adj. Amazingly large or great; huge. See Synonyms at enormous.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Astonishingly great or large; huge; enormous.
- adj. Of stunning volume, degree, or excellence; marvelous.
from the GNU version of the Collaborative International Dictionary of English
- adj. Astonishing; wonderful; amazing; especially, astonishing in magnitude or elevation.
from 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.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. so great in size or force or extent as to elicit awe
From Late Latin stupendus, stunning, gerundive of Latin stupēre, to be stunned.(American Heritage® Dictionary of the English Language, Fourth Edition)
First attested from 1547, from Late Latin stupendus ("stunning, amazing"), from Latin stupere ("to be stunned"). See also stupid. (Wiktionary)