The constant use had dulled the edge of the chef's knife.

The constant exposure to fluorescent lights is dulling her enthusiasm for photography.

Even though he tried to answer quickly, his dull-witted comments only made the meeting longer.

The professor's lecture was dull as dishwater, and half the students fell asleep.

Despite repeated explanations, his dull-headed questions slowed the entire team's progress.

At the dinner party, he was labeled a dull fish because he never added anything interesting to the conversation.

His storytelling was dull as ditchwater, leaving everyone looking for an excuse to leave.

The dull-minded intern kept asking the same basic questions even after the orientation.

With three curious kids and a mischievous dog, there's never a dull moment in our house.

My grandmother always warned me, 'too much bed makes a dull head,' whenever I stayed in on weekends.