Definition of stupefy

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stu·pe·fy    (stp-f, sty-) KEY 

TRANSITIVE VERB:
stu·pe·fied, stu·pe·fy·ing, stu·pe·fies

1. To dull the senses or faculties of. See Synonyms at daze.
2. To amaze; astonish.

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ETYMOLOGY:
Middle English stupefien, from Old French stupefier, from Latin stupefacere : stupre, to be stunned + facere, to make ; see fact

OTHER FORMS:
stupe·fier(Noun), stupe·fying·ly(Adverb)