flabbergast

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

• 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.

An awkward person.countable

Overwhelming confusion, shock, or surprise.uncountable

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