Also found in: Thesaurus, Legal.
1. So great in scope, degree, or importance as to amaze: a stupendous catastrophe.
2. Extremely large in amount, extent, or size; enormous: stupendous wealth; a stupendous waterfall.
3. Remarkable; outstanding: "Perhaps he had never possessed the necessary egoism, and was secretly relieved no longer having to be publicly stupendous" (Philip Roth).
[From Late Latin stupendus, stunning, gerundive of Latin stupēre, to be stunned.]