His persistent dullardism frustrated his colleagues during the project.

Despite being called a dullard, he solved the puzzle faster than anyone.

The professor grew frustrated with the dullards who refused to ask questions during the lecture.

Dullard is a surname that appears in the parish records dating back to the 1700s.

Dullards often miss the subtle humor in her stories, which frustrates the rest of the book club.

Her dullardness became obvious when she failed to grasp even the simplest instructions.