flabbergast verb to astound, to utterly confuse UK,1772
When I went to California I was flabbergasted to learn that smoking was banned in restaurants and bars. It was like some freaky joke. — TheGuardian, 8 July 2003
▶ my flabber is gasted; never has my flabber been so gasted I am astounded or astonished UK,1984 Jocular phrases formed on the verb FLABBERGAST