He's such a halfwit, he can't even tie his own shoes.

The room was filled with halfwits.

He is a halfwitted person.

He halfwittedly tried to fix the broken computer.

His halfwittedness was evident in his inability to solve simple math problems.

His constant halfwittery annoys everyone around him.

She was known as a halfwitch in the village.

The halfwitches gathered in the forest for their annual meeting.