a hostile state, condition, or attitude; enmity; antagonism; unfriendliness.

a hostile act.

opposition or resistance to an idea, plan, project, etc.

hostilities,

acts of warfare.

war.

noun

agreeableness , friendliness , friendship , gentleness , kindness , niceness

noun

abhorrence , aggression , animosity , animus , antipathy , aversion , bad blood * , bellicosity , belligerence , bitterness , detestation , disaffection , enmity , estrangement , grudge , hatred , ill will , inimicality , malevolence , malice , opposition , rancor , resentment , spite , spleen , unfriendliness , venom , virulence , war , warpath , bellicoseness , belligerency , combativeness , contentiousness , militance , militancy , pugnaciousness , pugnacity , truculence , truculency , antagonism , aggressiveness , confrontation , strife , struggle , warfare , argument , clash , feud , fighting , friction , resistance