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Noun: spoilsport  'spoyl,sport
  1. Someone who spoils the pleasure of others
    "Don't be a spoilsport; join in the fun!";
    - killjoy, wet blanket, party pooper, grinch [N. Amer, informal]

Derived forms: spoilsports

Type of: persona non grata, unwelcome person

Encyclopedia: Spoilsport