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Adjective: litigious  li'ti-jus
  1. Inclined or showing an inclination to dispute or disagree, even to engage in lawsuits
    "a litigious and acrimonious spirit";
    - contentious, combative, disputatious, disputative
     
  2. Of or relating to litigation
    "The company faced several litigious challenges"

See also: adversarial, argumentative

Encyclopedia: Litigious