Adjective matt has 1 sense
  1. flat, mat, matt, matte, matted - not reflecting light; not glossy; "flat wall paint"; "a photograph with a matte finish"
    Antonym: bright (indirect, via dull)
,Noun matt has 1 sense
  1. flatness, lusterlessness, lustrelessness, mat, matt, matte - the property of having little or no contrast; lacking highlights or gloss
    --1 is a kind of dullness, dulness
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