duller

"All these knives are dull."

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

"Choose a dull finish to hide fingerprints."

""After a long day at work, my mind feels duller and I have trouble focusing." "

"After a long, sleepless night, I felt much duller and less focused at work. "

"The day was duller than yesterday, with thick clouds blocking the sun. "

"After years of working at the factory, his heart grew duller to the suffering of his coworkers. "

"After a long illness, her eyes looked duller and showed little spark. "

"Pressing on the bruise produces a dull pain."

"The music sounded duller through the thick walls of the apartment. "

"The constant interruptions were a duller of his focus, making it impossible to finish his report. "