stupefy

Concise Oxford English Dictionary © 2008 Oxford University Press:
stupefy /ˈstjuːpɪfʌɪ/

▶verb (stupefies, stupefying, stupefied)

• 1 make (someone) unable to think or feel properly.

• 2 astonish and shock.

– derivatives
stupefaction noun,
stupefier noun,
stupefying adjective,
stupefyingly adverb.

– origin ME: from Fr. stupéfier, from L. stupefacere, from stupere ‘be struck senseless’.