flabbergast

verb

1. (transitive)To overwhelm with bewilderment; to amaze, confound, or stun, especially in a ludicrous manner.

   “He was flabbergasted to find that his work had been done for him before he began.”

   “Her stupidity flabbergasts me, and I have to force myself to keep a straight face while she explains her beliefs.”

   “The oddity of the situation was so flabbergasting I couldn’t react in time for anyone to see it.”

   “Now we are flabbergaſted and bored from morning to night—in the ſenate, at Cox's muſeum, at Ranelagh, and even at church.”

   “They flabagast good manners and good morals, and only show that one of the parties is vex'd and disappinted.^([sic])”

noun

1. (countable)An awkward person.
2. (uncountable)Overwhelming confusion, shock, or surprise.

   “His flabbergast was so great he couldn’t even come up with a plausible answer.”

   “Her foibles were flattery, fine feeling, and flabergast; and if not old enough to be his mother, sufficiently so to be a young aunt.”

   “Then quit your flabbergast, and talk in plain English.”

   “Bob's big-eyed flabbergast struck him as comic and he laughed and said, "Lying sack, hey?"”