Source : Webster's Revised Unabridged Dictionary (1913)

Agonistic \Ag`o*nis"tic\, Agonistical \Ag`o*nis"tic*al\, a. [Gr.
   ?. See {Agonism}.]
   Pertaining to violent contests, bodily or mental; pertaining
   to athletic or polemic feats; athletic; combative; hence,
   strained; unnatural.

         As a scholar, he [Dr. Parr] was brilliant, but he
         consumed his power in agonistic displays. --De Quincey.

Source : WordNet®

agonistic
     adj 1: of or relating to the athletic contests held in ancient
            Greece
     2: striving to overcome in argument; "a dialectical and
        agonistic approach" [syn: {agonistical}, {combative}]
     3: struggling for effect; "agonistic poses" [syn: {strained}]