What does argumentative mean?
The definition of argumentative
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.