hostile

If something is hostile, it's unfriendly. If you are zealous about the political causes you believe in, you will be hostile to any suggestion that the other side of the argument is reasonable.

Hostile comes from the Latin word hostis, for enemy, and you can hear its relation to the word hostage. But you don't have to be from a warring nation to be hostile. You can talk about a hostile nation, a hostile takeover, a hostile remark, or a hostile attitude. Some synonyms are inimical, antagonistic, unfavorable, unfriendly.

Definitions of hostile
  1. adjective
    characterized by enmity or ill will
    “a hostile nation”
    “a hostile remark”
    hostile actions”
    Synonyms:
    aggressive
    having or showing determination and energetic pursuit of your ends
    unfriendly
    not disposed to friendship or friendliness
    aggressive, belligerent
    characteristic of an enemy or one eager to fight
    adversarial, antagonistic, antipathetic, antipathetical
    characterized by antagonism or antipathy
    at loggerheads
    in a dispute or confrontation
    bitter
    proceeding from or exhibiting great hostility or animosity
    dirty
    expressing or revealing hostility or dislike
    head-on
    characterized by direct opposition
    ill
    indicating hostility or enmity
    opponent, opposing
    characterized by active hostility
    inimical, unfriendly
    not friendly
    hateful
    evoking or deserving hatred
    offensive
    for the purpose of attack rather than defense
    unpeaceful
    not peaceful
    violent
    acting with or marked by or resulting from great force or energy or emotional intensity
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    Antonyms:
    amicable
    characterized by friendship and good will
    friendly
    characteristic of or befitting a friend
    favorable, friendly, well-disposed
    inclined to help or support; not antagonistic or hostile
    unthreatening, well-meaning
    not unfriendly or threatening
    lovable, loveable
    having characteristics that attract love or affection
    peaceable, peaceful
    not disturbed by strife or turmoil or war
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  2. adjective
    not belonging to your own country's forces or those of an ally
    hostile naval and air forces”
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    Antonyms:
    friendly
    of or belonging to your own country's forces or those of an ally
  3. adjective
    unsolicited and resisted by the management of the target company (used of attempts to buy or take control of a business)
    hostile takeover”
    hostile tender offer”
    hostile bid”
    Synonyms:
    aggressive
    having or showing determination and energetic pursuit of your ends
  4. adjective
    impossible to bring into friendly accord
    hostile factions”
    Synonyms:
    irreconcilable, unreconcilable
    impossible to reconcile
  5. adjective
    very unfavorable to life or growth
    “a hostile climate”
    synonyms: uncongenial, unfriendly
    inhospitable
    unfavorable to life or growth
  6. noun
    troops belonging to the enemy's military forces
    “the platoon ran into a pack of hostiles
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    Antonyms:
    friendly
    troops belonging to or allied with your own military forces
    type of:
    military personnel, soldiery, troops
    soldiers collectively
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