hostility

hostility
/hɒsˈtɪl.ə.ti/

hostility noun (UNFRIENDLINESS)

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C2 [ U ] an occasion when someone is unfriendly or shows that they do not like something:

They showed open (= obvious) hostility to/towards their new neighbours.

hostility noun (UNFRIENDLINESS)

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C2 [ U ] an occasion when someone shows that they do not agree with or like something

hostility noun (FIGHTING)

hostilities [ plural ] formal

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fighting in a war:

Hostilities began/broke out just after midnight.

Hostilities were suspended (= fighting stopped temporarily) during the talks.

Cambridge Dictionary

Source : http://dictionary.cambridge.org/dictionary/english/hostility