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dumb·foundalso dum·found (dŭm′found′)
tr.v. dumb·found·ed, dumb·found·ing, dumb·founds also dum·found·ed or dum·found·ing or dum·founds
To fill with astonishment and perplexity; confound. See Synonyms at surprise.
astonished or amazed
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|Adj.||1.||dumbfounded - as if struck dumb with astonishment and surprise; "a circle of policement stood dumbfounded by her denial of having seen the accident"; "the flabbergasted aldermen were speechless"; "was thunderstruck by the news of his promotion"|
surprised - taken unawares or suddenly and feeling wonder or astonishment; "surprised by her student's ingenuity"; "surprised that he remembered my name"; "a surprised expression"
adjective amazed, stunned, astonished, confused, overcome, overwhelmed, staggered, thrown, startled, at sea, dumb, bewildered, astounded, breathless, confounded, taken aback, speechless, bowled over (informal), gobsmacked (Brit. slang), flabbergasted (informal), nonplussed, lost for words, flummoxed, thunderstruck, knocked sideways (informal), knocked for six (informal) I stood there dumbfounded.