#dullness__dulness__dulnes  a lack of visual brightness
  exclusion:  #brightness
  supertype:  #visual_property  an attribute of vision
  subtype:  #subduedness__subduednes__dimnes  the property of lacking brilliance
  subtype:  #flatness__lusterlessness__lustrelessness__mat__matte  the property of having little or no contrast; lacking highlights or gloss

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