Antagonism
WordNet
noun
(1) (biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure
(2) An actively expressed feeling of dislike and hostility
(3) The relation between opposing principles or forces or factors
"The inherent antagonism of capitalism and socialism"
(4) A state of deep-seated ill-will
WiktionaryText
Etymology
From , from .