Source : Webster's Revised Unabridged Dictionary (1913)

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

            Soldiers find wars, and lawyers find out still
            Litigious men, who guarrels move.     --Donne.

   2. Subject to contention; disputable; controvertible;
      debatable; doubtful; precarious. --Shak.

            No fences, parted fields, nor marks, nor bounds,
            Distinguished acres of litigious grounds. --Dryden.

   3. Of or pertaining to legal disputes.

            Nor brothers cite to the litigious bar. --Young.

Source : WordNet®

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}, {disputatious},
         {disputative}]