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HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
THESAURUS
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WORDNET DICTIONARY

Verb flabbergast has 1 sense

• flabbergast(v = verb.cognition) boggle, bowl over - overcome with amazement; "This boggles the mind!"
is one way to surprise
Sample sentences:
The bad news will flabbergast him
The good news will flabbergast her
The performance is likely to flabbergast Sue

CIDE DICTIONARY

OXFORD DICTIONARY

THESAURUS

flabbergast

amaze, astonish, astound, awe, awestrike, bedaze, bedazzle, bewilder, boggle, bowl down, bowl over, confound, daze, dazzle, dumbfound, dumbfounder, overwhelm, paralyze, perplex, petrify, shock, stagger, startle, strike dead, strike dumb, strike with wonder, stun, stupefy, surprise

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flabbergast

Wonder

VB wonder, marvel, admire, be surprised, start, stare, open one's eyes, rub one's eyes, turn up one's eyes, gloar, gape, open one's mouth, hold one's breath, look aghast, stand aghast, stand agog, look blank, tombe des nues, not believe one's eyes, not believe one's ears, not believe one's senses, not be able to account for, not know whether one stands on one's head or one's, surprise, astonish, amaze, astound, dumfound, dumfounder, startle, dazzle, daze, strike, strike with wonder, strike with awe, electrify, stun, stupefy, petrify, confound, bewilder, flabbergast, stagger, throw on one's beam ends, fascinate, turn the head, take away one's breath, strike dumb, make one's hair stand on end, make one's tongue cleave to the roof of one's mout, make one stare, take by surprise, be wonderful, beggar description, beggar the imagination, baffle description, stagger belief.

For further exploring for "flabbergast" in Webster Dictionary Online