Open English Wordnet
Adjectives
(s)antagonistic, antipathetic, antipatheticalcharacterized by antagonism or antipathy“slaves antagonistic to their masters”, “antipathetic factions within the party”
(a)antagonisticarousing animosity or hostility“his antagonistic brusqueness”, “Europe was antagonistic to the United States”
(a)antagonistic, incompatibleused especially of drugs or muscles that counteract or neutralize each other's effect