Flabergasted vs. Flabbergasted: What's the Difference?

Flabergasted and Flabbergasted Definitions
Flabergasted
Simple past tense and past participle of flabergast
Flabbergasted
To cause to be overcome with astonishment; astound.
Flabbergasted
Appalled, annoyed, exhausted or disgusted.{{cite-book
He was flabbergasted at how much weight he had gained.
Flabbergasted
Damned.{{cite-book
Flabbergasted
Simple past tense and past participle of flabbergast
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Flabbergasted
As if struck dumb with astonishment and surprise;
A circle of policement stood dumbfounded by her denial of having seen the accident
The flabbergasted aldermen were speechless
Was thunderstruck by the news of his promotion