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Adjective: contentious  kun'ten-shus
  1. Inclined or showing an inclination to dispute or disagree, even to engage in law suits
    "a style described as abrasive and contentious";
    - combative, disputatious, disputative, litigious
  2. Involving or likely to cause controversy
    "a central and contentious element of the book"

See also: adversarial, argumentative, controversial

Encyclopedia: Contentious