dull vs dun

dull

adj
  • Not clear, muffled. 

  • Not bright or intelligent; stupid; having slow understanding. 

  • Insensible; unfeeling. 

  • Not intense; felt indistinctly or only slightly. 

  • Sluggish, listless. 

  • Boring; not exciting or interesting. 

  • Not shiny; having a matte finish or no particular luster or brightness. 

  • Lacking the ability to cut easily; not sharp. 

  • Cloudy, overcast. 

  • Heavy; lifeless; inert. 

verb
  • To render dull; to remove or blunt an edge or something that was sharp. 

  • To soften, moderate or blunt; to make dull, stupid, or sluggish; to stupefy. 

  • To lose a sharp edge; to become dull. 

  • To render dim or obscure; to sully; to tarnish. 

dun

adj
  • Of a brownish grey colour. 

intj
  • Imitating a deep bass note, such as that found in suspenseful music. 

verb
  • To harass by continually repeating e.g. a request. 

  • To ask or beset a debtor for payment. 

noun
  • A collector of debts, especially one who is insistent and demanding. 

  • A fly made to resemble the mayfly subimago. 

  • A newly hatched, immature mayfly; a mayfly subimago. 

  • An ancient or medieval fortification; especially a hill-fort in Scotland or Ireland. 

  • A mound or small hill. 

  • A brownish grey colour. 

  • An urgent request or demand of payment. 

  • A structure in the Orkney or Shetland islands or in Scotland consisting of a roundhouse surrounded by a circular wall; a broch. 

How often have the words dull and dun occurred in a corpus of books? (source: Google Ngram Viewer )