1. the quality of lacking transparency or translucence: "thinner paints need black added to increase opacity"Similaropaquenessnon-transparencylack of transparencycloudinessfilminesshazinessmistinessblurblurrednessdirtinessdinginessmuddinessgriminesssmearinessOppositetransparencytranslucenceclarity
▪ the quality of being obscure in meaning:"the difficulty and opacity in Barthes' texts"Similarlack of clarityobscurityabstrusenessunclearnessdensityimpenetrabilityenigmaunintelligibilityincomprehensibilityreconditenessOppositeclaritylimpidity
Word Originmid 16th century: from French opacité, from Latin opacitas, from opacus ‘darkened’.