1. To render dull; to remove or blunt an edge or something that was sharp.
    Years of misuse have dulled the tools.
  2. To soften, moderate or blunt; to make dull, stupid, or sluggish; to stupefy.
    He drinks to dull the pain.
  3. To lose a sharp edge; to become dull.
    A razor will dull with use.
  4. To render dim or obscure; to sully; to tarnish.


  1. Lacking the ability to cut easily; not sharp.
  2. Boring; not exciting or interesting.
  3. Not shiny; having a matte finish or no particular luster or brightness.
    a dull fire or lamp; a dull red or yellow; a dull mirror
  4. Not bright or intelligent; stupid; slow of understanding.
  5. Sluggish, listless.
  6. Cloudy, overcast.
  7. Insensible; unfeeling.
  8. Heavy; lifeless; inert.

The above text is a snippet from Wiktionary: dull
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