Reverse Dictionary: FLABBERGAST

ADJECTIVES
GOB-SMACKED flabbergasted, surprised, astonished, astounded → 1985 Brit. sl.
GOB-STRUCK flabbergasted, surprised, astonished, astounded → 1988 Brit. sl.

VERBS
FLABAGATE to confuse, to flabbergast → 1834 Amer. dial.
FLABBERDEGASKY to flabbergast; to astonish greatly; to confound → 1822 obs.