What does "half-brained" mean?

Exhibiting low intelligence, as if having only half a brain.

What is a synonym for "half-brained"?

Common synonyms include: stupid.

adj

adj ·Rare ·Advanced level

Adjective

1
Exhibiting low intelligence, as if having only half a brain. not-comparable
"The manager's half-brained plan led to disaster when carried out."

"The manager's half-brained plan led to disaster when carried out."

From half + brained.