1856. Punch, Vol. 31. The Punch Office. page 240.We scarcely remember to have ever seen any respectable party in a greater state of flabbergastation than the writer of some observations in Mb. Cobden's Russo-Manchesterian organ, the Morning Star, of Thursday, December the fourth.
1918. Shaw Desmond. The Soul of Denmark. C. Scribner's Sons. page 96.I can recall my flabbergastation when in the house of a Jutlander of the middle class I heard him holding fluent converse with his children in some heathen dialect...
1944. Field and Stream: Volume 49. CBS Publications. page 90.Winchester .22 Automatic which we saw demonstrated (to our utter flabbergastation) in a local hardware store by a visiting Winchester representative.
1998. Newcomer's Guide to the Afterlife: On the Other Side Known Commonly as "The Little Book". Daniel Quinn, Tom Whalen. Random House Digital.Ignoring the other's utter flabbergastation, Matthews turned and graciously introduced him to me.
(archaic, colloquial, humorous) The act of confounding or bewildering.