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Adjective: debatable  di'bey-tu-bul
  1. Open to argument or debate
    "that is a debatable question";
    - arguable, disputable, moot
     
  2. Open to doubt or debate
    "If you ever get married, which seems to be extremely debatable";
    - problematic, problematical
     
  3. Capable of being disproved
    "The scientist's debatable theory sparked heated discussions";
    - disputable

See also: contestable, controversial, questionable

Encyclopedia: Debatable