antagonistic in WordNet English dictionary

1. arousing animosity or hostility
   "his antagonistic brusqueness"; "Europe was antagonistic to the Unites States"
   antagonistic 
   
2. used especially of drugs or muscles that counteract or neutralize each other's effect
   antagonistic  incompatible 
   
3. characterized by antagonism or antipathy
   "slaves antagonistic to their masters"; "antipathetic factions within the party"
   antagonistic  antipathetic  antipathetical 
   
4. incapable of harmonious association
   antagonistic 
   
5. indicating opposition or resistance
   antagonistic  counter