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.
Not shiny; having a matte finish or no particular luster or brightness.
Choose a dull finish to hide fingerprints.
Not bright or intelligent; stupid; having slow understanding.
Sluggish, listless.
Cloudy, overcast.
It's a dull day.
Insensible; unfeeling.
Heavy; lifeless; inert.
(of pain etc) Not intense; felt indistinctly or only slightly.
Pressing on the bruise produces a dull pain.
(of a noise or sound) Not clear, muffled.
One who, or that which, dulls.