Antagonism

n.

1.

Opposition of action; counteraction or contrariety of things or principles.

Noun	1.	antagonism - a state of deep-seated ill-will Synonyms: enmity, hostility
	2.	antagonism - the relation between opposing principles or forces or factors; "the inherent antagonism of capitalism and socialism"
	3.	antagonism - an actively expressed feeling of dislike and hostility
	4.	antagonism - (biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure

abhorrence, abomination, aggression, aggressiveness, allergy, animosity, animus, annulling, antipathy, antithesis, argumentation, aversion, backlash, bad blood, bellicism, bellicosity, belligerence, belligerency, chauvinism, clash, clashing, cold sweat, collision, combativeness, competition, con, confrontation, confutation, contention, contentiousness, contradiction, contradistinction, contraindication, contraposition, contrariety, contrariness, contrast, controversy, counteraction, counterposition, counterworking, crankiness, creeping flesh, cross-purposes, crotchetiness, despitefulness, difference, disaccord, disaccordance, disagreement, discord, discordance, discordancy, discrepancy, disgust, disharmony, disparity, dissension, dissent, dissidence, dissonance, disunion, disunity, divergence, diversity, faction, ferocity, fierceness, fight, fractiousness, friction, hate, hatred, horror, inaccordance, incongruity, inconsistency, inequality, inimicalness, interference, jarring, jingoism, kick, loathing, malevolence, malice, malignity, martialism, militancy, militarism, mortal horror, nausea, negation, negativeness, nonconformity, noncooperation, nullification, obstinacy, oppositeness, opposure, oppugnance, oppugnancy, perverseness, perversity, polarity, pugnaciousness, pugnacity, quarrelsomeness, rancor, reaction, recalcitrance, recoil, refractoriness, renitency, repercussion, repugnance, repulsion, resistance, revolt, rivalry, saber rattling, showdown, shuddering, spite, spitefulness, strife, swimming upstream, truculence, uncooperativeness, unfriendliness, unharmoniousness, unpeacefulness, variance, vying, warmongering, warpath, withstanding