WordReference Random House Unabridged Dictionary of American English © 2025
stu•pe•fac•tive
(sto̅o̅′pə fak′tiv, styo̅o̅′-),USA pronunciation adj.
- serving to stupefy.
- Medieval Latin stupefactīvus, equivalent. to Latin stupefact(us) (see stupefaction) + -īvus -ive
- 1520–30