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dull [ˈdʌl]

1 dull adjective
  • not exciting or interesting : boring
  • having an edge or point that is not sharp
  • not clear and loud
2 dull verb
  • to become dull or to make (something) dull: such as
  • to become or cause (something) to become less clear, distinct, bright, or shiny
  • to make (something, such as a feeling) less sharp, strong, or severe