Hostility is the state of ill will and bad feeling. If a teacher embarrasses you in front of the whole class, you will probably regard him or her with hostility for the remainder of the school year.

Hostility can be used to describe aggressive relations between two countries as well as between people. The issue of territorial borders can often cause hostility between neighboring countries. If actual fighting breaks out, use the word hostilities to refer to the violent actions between them. The ordinary citizens of the countries involved will look forward to the end of hostilities when the two governments are able to work together for peace.

Definitions of hostility
  1. noun
    a state of deep-seated ill-will
    synonyms: antagonism, enmity
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    Cold War
    a state of political hostility that existed from 1945 until 1990 between countries led by the Soviet Union and countries led by the United States
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    latent hostility, tension
    feelings of hostility that are not manifest
    state of war, war
    a legal state created by a declaration of war and ended by official declaration during which the international rules of war apply
    cold war
    a state of political hostility between countries using means short of armed warfare
    the state of being suspected
    proxy war
    a war instigated by a major power that does not itself participate
    suspicion affecting your reputation
    type of:
    the way something is with respect to its main attributes
  2. noun
    violent action that is hostile and usually unprovoked
    synonyms: aggression
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    meat grinder
    any action resulting in injury or destruction
    force, violence
    an act of aggression (as one against a person who resists)
    pillage, pillaging, plundering
    the act of stealing valuable things from a place
    domestic violence
    violence or physical abuse directed toward your spouse or domestic partner; usually violence by men against women
    the practice of plundering in gangs
    rape, rapine
    the act of despoiling a country in warfare
    looting, robbery
    plundering during riots or in wartime
    despoilation, despoilment, despoliation, spoil, spoilation, spoliation
    the act of stripping and taking by force
    devastation, ravaging
    plundering with excessive damage and destruction
    depredation, predation
    an act of plundering and pillaging and marauding
    the plundering of a place by an army or mob; usually involves destruction and slaughter
    road rage
    violence exhibited by drivers in traffic
    public violence, riot
    a public act of violence by an unruly mob
    type of:
    something done (usually as opposed to something said)
  3. noun
    the feeling of a hostile person
    “he could no longer contain his hostility
    synonyms: enmity, ill will
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    animosity, animus, bad blood
    a feeling of ill will arousing active hostility
    class feeling
    feelings of envy and resentment of one social or economic class for toward another
    an actively expressed feeling of dislike and hostility
    aggression, aggressiveness
    a feeling of hostility that arouses thoughts of attack
    belligerence, belligerency
    hostile or warlike attitude or nature
    bitterness, gall, rancor, rancour, resentment
    a feeling of deep and bitter anger and ill-will
    hostile or belligerent mood
    intense resentment
    huffishness, sulkiness
    a feeling of sulky resentment
    grievance, grudge, score
    a resentment strong enough to justify retaliation
    enviousness, envy
    a feeling of grudging admiration and desire to have something that is possessed by another
    type of:
    hate, hatred
    the emotion of intense dislike; a feeling of dislike so strong that it demands action
  4. noun
    a hostile (very unfriendly) disposition
    “he could not conceal his hostility
    synonyms: ill will
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    virulence, virulency
    extreme hostility
    type of:
    an unfriendly disposition
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