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1. A hostile (very unfriendly) disposition
   "he could not conceal his hostility";
   - ill will
    
2. A state of deep-seated ill-will
   - enmity, antagonism
    
3. The feeling of a hostile person
   "he could no longer contain his hostility";
   - enmity, ill will
    
4. Violent action that is hostile and usually unprovoked
   - aggression

Derived forms: hostilities

Type of: action, hate, hatred, state, unfriendliness

Encyclopedia: Hostility