Longman Dictionary of Contemporary English homepage

dumbfounded

 adjective
     
dumb‧found‧ed
extremely surprised:
He was completely dumbfounded by the incident.
—dumbfound verb [transitive]
WORD FOCUS: surprised WORD FOCUS: surprised
very surprised: amazed, astonished, astounded, dumbfounded, staggered, flabbergasted, gobsmacked BrE informal, speechless, be lost for words, can't believe your eyes/earssurprised

➔ See also surprised
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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