Definitions for: Flabbergast

[v] overcome with amazement; "This boggles the mind!"

Webster (1913) Definition: Flab"ber*gast, v. t. [Cf. Flap, and Aghast.]
To astonish; to strike with wonder, esp. by extraordinary
statements. [Jocular] --Beaconsfield.

Synonyms: boggle, bowl over

See Also: surprise