gobsmacked [ gob-smakt ]

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Synonyms: awestruck, astonished, flabbergast, dumbfounded, taken-aback, freaked-out, dumbstruck, amazed, apalled, etc.

Definition of gobsmacked

adjective (Chiefly British Slang)

       overwhelmed with wonder, surprise, or shock / utterly astounded, astonished:   
Examples:    He was gobsmacked when he heard of the redundancies.
   I was gobsmacked when she told me the news.   I was, to coin a phrase, gobsmacked!   We were truly gobsmacked by his decision.