stumped
v. B2 Upper Intermediate US //ˈstəmpt// UK //stˈʌmpt// stumped
v. feeling completely confused or unable to find an answer. You use this when you are stuck on a problem and cannot move forward.
v. feeling completely baffled or unable to solve a problem. Often used in the passive voice to indicate a state of confusion.
I am completely stumped by this math problem.
The detective was stumped by the lack of evidence and had to start the investigation from scratch.
Even the most experienced engineers were stumped by the sudden failure of the software, as the error logs provided no clear indication of the underlying cause.