ar·gu·men·ta·tive /ˌɑrgjəˈmɛntətɪv/
  (a.)好辯的,愛窮根究理的,爭論的
  Ar·gu·men·ta·tive a.
  1. Consisting of, or characterized by, argument; containing a process of reasoning; as, an argumentative discourse.
  2. Adductive as proof; indicative; as, the adaptation of things to their uses is argumentative of infinite wisdom in the Creator. [Obs.]
  3. Given to argument; characterized by argument; disputatious; as, an argumentative writer.
  --Ar*gu*men*ta*tive*ly, adv. -- Ar*gu*men*ta*tive*ness, n.
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  argumentative
       adj : given to or characterized by argument; "an argumentative
             discourse"; "argumentative to the point of being
             cantankerous"; "an intelligent but argumentative child"
             [ant: unargumentative]