dumb-ass 
adjective [attributive] North American informal
Stupid; brainless: dumb-ass politicians...
- Time and time again, we are inches away from dumb-ass politicians making disastrous decisions.
- What is the most dumb-ass thing you ever did in your life?
- Maybe you could argue that the government has been permissive in not criticizing Liberal party officials who make dumb-ass statements, but that's a complaint to register privately, not publicly.