dull
adjective
°Lacking the ability to cut easily; not sharp.
"All these knives are dull."
°Boring; not exciting or interesting.
"He sat through the dull lecture and barely stayed awake."
verb
°To render dull; to remove or blunt an edge or something that was sharp.
"Years of misuse have dulled the tools."
°To soften, moderate or blunt.
"He drinks to dull the pain."
synonyms: lackluster, matte