dullest

"All these knives are dull."

"He sat through the dull lecture and barely stayed awake."

"Choose a dull finish to hide fingerprints."

"He was often called the dullest student in the class because he struggled to understand even the simplest concepts. "

"After a sleepless night, Monday morning felt like the dullest time of the week. "

"The sky was at its dullest, a heavy gray blanket that threatened rain all day. "

"After years of routine work, his senses had become dullest to the beauty around him. "

"The old, unused textbook was the dullest object in the classroom. "

"Pressing on the bruise produces a dull pain."

"The dullest thud came from upstairs, like someone dropped a heavy book on a thick carpet. "