e.g. She thought the book was dull and didn't finish reading it.
e.g. My knife was dull and didn't cut things well. I heard a dull sound but couldn't tell what it was. He had a dull ache in his head.
e.g. He wore dull gray clothes so as to not attract attention. It was a dull and cloudy day.
e.g. If she weren't so dull, she would have finished the task much sooner.
e.g. Many drugs dull the senses and cause one to feel numb.
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