(colloquial) Bewildered shock or surprise; the state or condition of being flabbergasted. / (archaic, colloquial, humorous) The act of confounding or bewildering.

Synonym of flabbergast (“overwhelming shock or surprise”)

Third-person singular simple present indicative form of flabbergaster

simple past tense and past participle of flabbergaster

present participle of flabbergaster

Surprisingly, astonishingly or amazingly

in a flabbergasted manner.