antagonistic

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 antagonistic brusqueness”; “Europe was antagonistic to the Unites States”
  4. used especially of drugs or muscles that counteract or neutralize each other’s effect
  5. incapable of harmonious association