1
: tedious, uninteresting
dull lectures
2
: lacking sharpness of edge or point
a dull knife
3
a
: not resonant or ringing
a dull booming sound
b
: lacking in force, intensity, or sharpness
a dull ache
4
: lacking brilliance or luster
a dull finish
5
: cloudy
dull weather
6
of a color : low in saturation (see saturation sense 4a) and low in lightness
a dull green
7
: mentally slow : stupid
8
a
: slow in perception or sensibility : insensible
somewhat dull of hearing
dull to what went on about her Willa Cather
b
: lacking zest (see zest sense 2) or vivacity : listless
a dull performance
9
: slow in action : sluggish
dull markets
dullness noun

dull

2 of 2

verb

dulled; dulling; dulls

transitive verb

: to make dull
dull a knife's edge

intransitive verb

: to become dull
The blade dulled with use.
Choose the Right Synonym for dull

dull, blunt, obtuse mean not sharp, keen, or acute.

dull suggests a lack or loss of keenness, zest, or pungency.

a dull pain
a dull mind

blunt suggests an inherent lack of sharpness or quickness of feeling or perception.

a person of blunt sensibility

obtuse implies such bluntness as makes one insensitive in perception or imagination.

too obtuse to take the hint

synonyms see in addition stupid

Examples of dull in a Sentence

Adjective the dull roar of the crowd the dull knife just bounced off the skin of the tomato without cutting it Verb
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Adjective
For the rest of us, a real musical comedy is a cause for celebration; most are either too tuneless to be musicals or too dull to be comedies. Jesse Green, New York Times, 11 Apr. 2025 The additional compounds in matcha dull this effect. Helen Carefoot, Verywell Health, 11 Apr. 2025
Verb
Ahead, find Vogue’s top products for keeping the face radiant, smooth, and defiant to glow-dulling buildup and fuzz. Jenny Berg, Vogue, 20 Mar. 2025 Garrett Reisman, a former NASA astronaut who spent 95 days in space, told CNN earlier this week that the fluid shift in space also dulls smell and taste. Avery Lotz, Axios, 18 Mar. 2025 See All Example Sentences for dull

Word History

Etymology

Adjective and Verb

Middle English dul; akin to Old English dol foolish, Old Irish dall blind

First Known Use

Adjective

13th century, in the meaning defined at sense 7

Verb

13th century, in the meaning defined at transitive sense

Time Traveler
The first known use of dull was in the 13th century

Browse Nearby Words

Cite this Entry

“Dull.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dull. Accessed 17 Apr. 2025.

Kids Definition

1
: mentally slow : stupid
2
3
: slow in action : sluggish
4
: lacking sharpness of edge or point
5
: lacking brilliance or luster
6
: not ringing, sharp, or intense
a dull roar
7
8
: tedious, uninteresting
a dull lecture
9
: slightly grayish
a dull blue

dull

2 of 2 verb
: to make or become dull

Medical Definition

1
: mentally slow or stupid
2
: slow in perception or sensibility
3
: lacking sharpness of edge or point
a dull scalpel
4
: lacking in force, intensity, or acuteness
a dull pain
dull verb

More from Merriam-Webster on dull

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