/ Dictionary / Index S stupendous: Meaning and Definition of Find definitions for: stu•pen•dous Pronunciation: (st-pen'dus, sty-), [key] — adj. causing amazement; astounding; marvelous: stupendous news. amazingly large or great; immense: a stupendous mass of information. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: stupendous (Thesaurus) stupefy stupid Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language