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Adjective: antagonistic  an,ta-gu'nis-tik
  1. Indicating opposition or resistance
    - counter
     
  2. Characterized by antagonism or antipathy
    "slaves antagonistic to their masters";
    - antipathetic, antipathetical
     
  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
    - incompatible
     
  5. Incapable of harmonious association

See also: alienating, antacid, antiphlogistic, hostile, incompatible, negative

Antonym: conciliatory, synergistic

Encyclopedia: Antagonistic