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