1) Amazed 2) Awed 3) Benumbed 4) Bewildered 5) Boggled 6) Confused 7) Dazed 8) Dopy 9) Dumbfounded 10) Dumfounded 11) Flabbergasted 12) In a daze 13) Inawe 14) Lobotomized 15) Numb 16) Surprised 17) Thunderstruck 18) Traned 19) Vague 20) Zonkedout 1) Amazed 2) Dumbfounded 3) Dumfounded 4) Flabbergasted 5) Surprised 6) Thunderstruck 
• (a.) Having been made stupid. • (imp. & p. p.) of Stupefy
Stu'pe·fied adjective Having been made stupid. 
stupefy, stupefies, stupefying, stupefied 1. To put into a state of little or no sensibility; to benumb the faculties of; to put into a stupor. 2. To stun, as with a narcotic, a shock, or a strong emotion. 3. To overwhelm with amazement; to astound; to astonish.
as if struck dumb with astonishment and surprise