The difference between Dull and Matte
When used as adjectives, dull means lacking the ability to cut easily, whereas matte means dull.
Dull is also verb with the meaning: to render dull.
Matte is also noun with the meaning: a decorative border around a picture.
check bellow for the other definitions of Dull and Matte
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Dull as an adjective:
Lacking the ability to cut easily; not sharp.
Examples:
"All these knives are dull."
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Dull as an adjective:
Boring; not exciting or interesting.
Examples:
"He sat through the dull lecture and barely stayed awake."
"When does having a dull personality ever get you a girlfriend? Even if you get one, how does being dull help you keep a relationship for over a year?"
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Dull as an adjective:
Not shiny; having a matte finish or no particular luster or brightness.
Examples:
"Choose a dull finish to hide fingerprints."
"a dull fire or lamp;  a dull red or yellow;  nowrap a dull mirror"
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Dull as an adjective:
Not bright or intelligent; stupid; slow of understanding.
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Dull as an adjective:
Sluggish, listless.
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Dull as an adjective:
Cloudy, overcast.
Examples:
"It's a dull day."
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Dull as an adjective:
Insensible; unfeeling.
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Dull as an adjective:
Heavy; lifeless; inert.
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Dull as an adjective (of pain etc):
Not intense; felt indistinctly or only slightly.
Examples:
"Pressing on the bruise produces a dull pain."
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Dull as an adjective:
Not clear, muffled.
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Dull as a verb (transitive):
To render dull; to remove or blunt an edge or something that was sharp.
Examples:
"Years of misuse have dulled the tools."
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Dull as a verb (transitive):
To soften, moderate or blunt; to make dull, stupid, or sluggish; to stupefy.
Examples:
"He drinks to dull the pain."
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Dull as a verb (intransitive):
To lose a sharp edge; to become dull.
Examples:
"A razor will dull with use."
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Dull as a verb:
To render dim or obscure; to sully; to tarnish.
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Matte as a noun (arts, photography):
A decorative border around a picture
Examples:
"The image is a perfect square of 8 cm (with white matte border the total dimensions are 14 cm tall by 11 cm wide)."
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Matte as a noun (cinema):
A background, often painted or created with computers
Examples:
"Matte painting is a tool that filmmakers can use to create a scene that is either too impractical, too costly or simply too impossible to achieve with conventional cinematographic means."
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Matte as a noun (pyrometallurgy):
The molten metal sulfide phases typically formed during smelting of copper, nickel, and other base metals
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Matte as an adjective (American spelling):
Dull; not reflective of light.
Examples:
"Flat or matte paint allows a deep color expression on the walls while also hiding flaws that may be inherent on the painted surface."