1. Struggling for effect
   "agonistic poses";
   - strained
    
2. Of or relating to the athletic contests held in ancient Greece
   "The agonistic spirit of the Olympic Games has its roots in ancient Greek culture"
    
3. Striving to overcome in argument
   "a dialectical and agonistic approach";
   - agonistical, combative

See also: affected, competitive, competitory, unnatural

Encyclopedia: Agonistic