brain-dead

1 of 1adjective

/ˈbreɪndɛd/

1

acting extremely unintelligent, foolish, or incapable of thinking clearly

That was a brain-dead mistake on the project.
Don't be brain-dead, read the instructions first.
He felt brain dead after staying up all night.
Only a brain-dead person would forget their own password.
She called him brain-dead for ignoring the obvious answer.