Etymology
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flabbergast (v.)

1772, flabbergasted, mentioned (with bored) in a magazine article that year as a new vogue word, of uncertain origin. Perhaps from some dialect (in 1823 flabbergast was noted as a Sussex word), perhaps ultimately an arbitrary formation alluding to flabby or flapper and aghast. "Like many other popular words expressing intensity of action, ... not separable into definite elements or traceable to a definite origin" [Century Dictionary]. Related: Flabbergasted; flabbergasting; flabbergastation.

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Definitions of flabbergast

flabbergast (v.)
overcome with amazement;
Synonyms: boggle / bowl over
From wordnet.princeton.edu

Dictionary entries near flabbergast

fizz

fizzle

fizzy

fjord

flab

flabbergast

flabbergasted

flabby

flaccid

flack

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