hostility

noun
  1. A state or condition of being unfriendly, antagonistic, or opposed to someone or something. noun
    The hostility between the two countries has escalated into a full-scale conflict.
    She could sense the hostility in his voice when he spoke about the new policy.
  2. Acts of warfare or aggression; military conflict. noun
    Hostilities ceased after the peace treaty was signed.
    The region has been plagued by hostilities for decades.