WordReference Random House Learner's Dictionary of American English © 2026
stu•pe•fy /ˈstupəˌfaɪ, ˈstyu-/USA pronunciation   v. [+ object], -fied, -fy•ing. 
  1. Pathologyto make (someone) tired, exhausted, or very bored:The teacher's boring lecture stupefied the entire class.
  2. Pathologyto stun, as with strong emotion:We were stupefied by his sudden death.
  3. to overwhelm with amazement or surprise:stupefied by the sight of all those people rushing through the square.
stu•pe•fac•tion /ˌstupəˈfækʃən/USA pronunciation  n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2026
stu•pe•fy  (sto̅o̅pə fī′, styo̅o̅-),USA pronunciation v.t., -fied, -fy•ing. 
  1. Pathologyto put into a state of little or no sensibility; benumb the faculties of;
    put into a stupor.
  2. Pathologyto stun, as with a narcotic, a shock, or a strong emotion.
  3. to overwhelm with amazement;
    astound;
    astonish.
  • Middle French stupefier Latin stupefacere to benumb, equivalent. to stupe-, stem of stupēre to be numb or stunned + facere to make, do1; see -fy
  • 1590–1600
stu•pe•fied•ness  (sto̅o̅pə fīd′nis, -fī′id-, styo̅o̅-),USA pronunciation n.  stupe•fi′er, n. 
stupe•fy′ing•ly, adv. 

'stupefier' also found in these entries (note: many are not synonyms or translations):

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