dull /dʌl/adjective 11verb 5noun 1forms 6 adjective11 •Lacking the ability to cut easily; not sharp.All these knives are dull. •without anything lively or new, so that people soon lose interestHe sat through the dull lecture and barely stayed awake. •Not intense; felt indistinctly or only slightly.Pressing on the bruise produces a dull pain. •Not clear, muffled. (of a noise or sound) •Not shiny; having a matte finish or no particular luster or brightness.Choose a dull finish to hide fingerprints.a dull fire or lamp •Cloudy, overcast.It's a dull day. •Not bright or intelligent; stupid; having slow understanding.She is not bred so dull but she can learn. — 1596 •Sluggish, listless.This people's heart is waxed gross, and their ears are dull of hearing. — 1611 •Heavy; lifeless; inert.As turning the logs will make a dull fire burn, so changes of study a dull brain. — 1857 •Bored, depressed, down.I felt dull all day. •Insensible; unfeeling.Think me not / So dull a devil to forget the loss / Of such a matchless wife. — 1616 verb5 •To render dull; to remove or blunt an edge or something that was sharp.Years of misuse have dulled the tools. •To lose a sharp edge; to become dull.A razor will dull with use. •To soften, moderate or blunt; to make dull, stupid, or sluggish; to stupefy.He drinks to dull the pain. •To render dim or obscure; to sully; to tarnish. •(Ireland, no longer used) To fish (or snare an animal, especially a fish) with such a noose.I hope that the barbarous practice called dulling has gone out of fashion. — 1880 noun1 •(Ireland, no longer used) A noose of string, metal wire, or hair used to snare an animal, especially a fish.Play fair, boys. No dynamite nor "dulling." The deadly "dull," or wire noose, is a fatal weapon against a trout. — 1903 formsdulled · dulling · dulleth · dulls · duller · dullest