matt US/mæt/ common uk noun (1) adjective (1) noun 1. the property of having little or no contrast; lacking highlights or gloss Synonymsflatnesslusterlessnesslustrelessnessmatmatte adjective 1. not reflecting light; not glossy “flat wall paint” “a photograph with a matte finish” Synonymsflatmatmattematted Similardull Related words Word family mat Broader terms dullness WordNet 2.1 (Princeton University). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.