Dun/dʌn/ Definition 1 of 4Pro Tip 1/2Color Description Use 'dun' to describe objects with a muted brownish-gray color often found in nature. The dun hills faded into the horizon. Pro Tip 2/2Visual Imagery 'Dun' evokes a natural, earthy feel and can be used to set a subdued, rustic scene. The room was decorated in shades of dun and green.