Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Origin: Perhaps from flabby + aghast (= shocked)

flabbergasted

 adjective
     
flab‧ber‧gas‧ted informal
extremely surprised or shocked:
When I heard how much money we'd made, I was flabbergasted.
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
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