litigious

from WordNet (r) 3.0 (2006)

litigious
    adj 1: of or relating to litigation
    2: inclined or showing an inclination to dispute or disagree,
       even to engage in law suits; "a style described as abrasive
       and contentious"; "a disputatious lawyer"; "a litigious and
       acrimonious spirit" [syn: {contentious}, {combative},
       {disputatious}, {disputative}, {litigious}]

from The Collaborative International Dictionary of English v.0.48

Litigious \Li*ti"gious\, a. [L. litigiosus, fr. litigium
   dispute, quarrel, fr. litigare: cf. F. litigieux. See
   {Litigation}.]
   1. Inclined to initiate lawsuits; given to the practice of
      contending in law; fond of litigation. " A pettifogging
      attorney or a litigious client." --Macaulay.
      [1913 Webster]

            Soldiers find wars, and lawyers find out still
            Litigious men, who quarrels move.     --Donne.
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   2. Hence: Quarrelsome; contentious; argumentative.
      [1913 Webster]

   3. Subject to contention; disputable; controvertible;
      debatable; doubtful; precarious. --Shak.
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            No fences, parted fields, nor marks, nor bounds,
            Distinguished acres of litigious grounds. --Dryden.
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   4. Of or pertaining to legal disputes.
      [1913 Webster]

            Nor brothers cite to the litigious bar. --Young.
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from Bouvier's Law Dictionary, Revised 6th Ed (1856)

LITIGIOUS. That which is the subject of a suit or action; that which is 
contested in a court of justice. In another sense, litigious signifies a 
disposition to sue; a fondness for litigation.

from Moby Thesaurus II by Grady Ward, 1.0

37 Moby Thesaurus words for "litigious":
      actionable, aggressive, argumental, argumentative, bellicose,
      belligerent, bickering, cat-and-dog, cat-and-doggish, causidical,
      combative, contentious, controversial, dialectic, disputatious,
      divisive, eristic, factional, factious, ill-humored, irascible,
      irritable, litigable, litigant, litigatory, logomachic, partisan,
      pilpulistic, polarizing, polemic, polemical, pro and con,
      pugnacious, quarrelsome, scrappy, shrewish, wrangling