not sharp; blunt: a dull knife.
causing boredom; tedious; uninteresting: a dull sermon.
not lively or spirited; listless.
not bright, intense, or clear; dim: a dull day; a dull sound.
having very little depth of color; lacking in richness or intensity of color.
slow in motion or action; not brisk; sluggish: a dull day in the stock market.
mentally slow; lacking brightness of mind; somewhat stupid; obtuse.
lacking keenness of perception in the senses or feelings; insensible; unfeeling.
not intense or acute: a dull pain.
to make or become dull.
- dullness, dulness, noun
- dully, adverb
- un·dulled, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use dull in a sentence
Both are real questions high-schoolers face at this point in their lives, but that doesn’t amount to engaging conflict here thanks to a dull screenplay.It was time for the ‘To All the Boys’ franchise to end | Sonia Rao | February 12, 2021 | Washington Post
Finally, Winceworth finds his labor to be so dull that he creates fake words and sneaks them into Swansby’s Dictionary.‘Liar’s Dictionary’ a fab, queer tale for lovers of language | Kathi Wolfe | January 29, 2021 | Washington Blade
A dull village life might have prompted our ancestors to explore what might be across that river, or perhaps to try a new berry they found in the woods.
Place the shiny side next to your body, as the dull silver side reflects only 65 percent of radiated heat.
Long gone are the days of dead batteries, dull blades, and desperate trips to the barber.The best beard trimmer: Shape your facial hair with ease | Carsen Joenk | January 19, 2021 | Popular-Science
But the man appears so weary that I decide to skip the dull stuff and get to the heat.Alfred Hitchcock’s Fade to Black: The Great Director’s Final Days | David Freeman | December 13, 2014 | THE DAILY BEAST
The work at Art Basel is often interesting, often dull, and disproportionately decorative in nature.Sneer and Clothing in Miami: Inside The $3 Billion Woodstock of Contemporary Art | Jay Michaelson | December 6, 2014 | THE DAILY BEAST
His course managed to be both dreadfully dull and appallingly difficult, with few light moments.
I was quoted in The New York Times saying, ‘We dared to be dull’.Can Obama and a Republican Senate Find Common Ground? | Eleanor Clift | November 4, 2014 | THE DAILY BEAST
According to Mack, he nearly killed her, broke 18 of her bones and, “sawed much of my hair off with [a] dull knife.”The MMA Fighters Have Gone Crazy: ‘Mayhem’ Miller the Latest in a Long Line of Psycho Pugilists | Robert Silverman | October 10, 2014 | THE DAILY BEAST
The policemen looked dull and heavy, as if never again would any one be criminal, and as if they had come to know it.Bella Donna | Robert Hichens
Drone: the largest tube of a bag-pipe, giving forth a dull heavy tone.Gulliver's Travels | Jonathan Swift
It'll be beastly dull for her at The Warren, you see, poor girl; and she doesn't seem to jump at Spunyarn, though he does hang on.The Pit Town Coronet, Volume I (of 3) | Charles James Wills
They are grayish or colorless, and have a dull waxy look, as if cut from paraffin (Figs. 43 and 61).A Manual of Clinical Diagnosis | James Campbell Todd
There was a distant, dull boom in the air—a repeated heavy thud.Kipling Stories and Poems Every Child Should Know, Book II | Rudyard Kipling
British Dictionary definitions for dull
slow to think or understand; stupid
lacking in interest
lacking in perception or the ability to respond; insensitive
lacking sharpness; blunt
not acute, intense, or piercing
(of weather) not bright or clear; cloudy
not active, busy, or brisk
lacking in spirit or animation; listless
(of colour) lacking brilliance or brightness; sombre
not loud or clear; muffled
med (of sound elicited by percussion, esp of the chest) not resonant
to make or become dull
- dullish, adjective
- dullness or dulness, noun
- dully, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Other Idioms and Phrases with dull
In addition to the idiom beginning with dull
- dull as dishwater
- never a dull moment
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.