/ Dictionary / Index S stupefactive: Meaning and Definition of Find definitions for: stu•pe•fac•tive Pronunciation: (st"pu-fak'tiv, sty"-), [key] — adj. serving to stupefy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. stupefaction stupefy Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language