He gave a duncelike answer when asked a simple question.

The committee dismissed his repeated dunceries as harmless eccentricities.

After the council's poor decision-making, City Hall had become a duncedom where common sense was rare.

After weeks of monotony, his duncery seemed to deepen, making every task feel like a chore.

The teacher sighed as the classroom filled with dunceheads who had forgotten their homework.

After realizing he'd missed the deadline, he muttered that he was a duncehead and left the room embarrassed.

His dunceish grin made everyone around him wince.

His duncey remarks during the meeting embarrassed everyone.

Despite his occasional moments of insight, his persistent duncehood made his classmates underestimate him.