argumentative

from WordNet (r) 3.0 (2006)

argumentative
    adj 1: given to or characterized by argument; "an argumentative
           discourse"; "argumentative to the point of being
           cantankerous"; "an intelligent but argumentative child"
           [ant: {unargumentative}]

from The Collaborative International Dictionary of English v.0.48

Argumentative \Ar`gu*men"ta*tive\, a.
   1. Consisting of, or characterized by, argument; containing a
      process of reasoning; as, an argumentative discourse.
      [1913 Webster]

   2. Adductive as proof; indicative; as, the adaptation of
      things to their uses is argumentative of infinite wisdom
      in the Creator. [Obs.]
      [1913 Webster]

   3. Given to argument; characterized by argument;
      disputatious; as, an argumentative writer.
      [1913 Webster] --{Ar`gu*men"ta*tive*ly}, adv. --
      {Ar`gu*men"ta*tive*ness}, n.
      [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

21 Moby Thesaurus words for "argumentative":
      argumental, belligerent, cat-and-dog, cat-and-doggish, combative,
      contentious, controversial, dialectic, disagreeable, disputatious,
      eristic, ill-humored, litigious, logomachic, pilpulistic, polemic,
      polemical, pro and con, quarrelsome, scrappy, testy