Flummoxed:
Informal. utterly bewildered, confused, or puzzled:
When I walk into a store to buy video equipment and see the multitude of options, I’m befuddled and flummoxed. [Dictionary.com]
Our source gives 1835 as the oldest known usage; flummoxed was certainly old, even out of date, when I was a kid. Noted in “Trump’s familiar routine after failing to cut deals with Congress: Signing legally dubious executive actions,” Toluse Olorunnipa and Ashley Parker, WaPo:
The president who pitched himself to voters as the consummate negotiator and ultimate dealmaker has repeatedly found his strategies flummoxed by the complexities and pressures of Washington lawmaking. In response, he has frequently relied on showmanship and pageantry to try to turn negotiating failures into victories.
This WaPo article dates from 2020, incidentally.
