1.AdjectiveNot friendly; appropriate to an enemy; showing the disposition of an enemy; showing ill will and malevolence or a desire to thwart and injure.
"a hostile force; hostile intentions; a hostile country; hostile to a sudden change"
2.AdjectiveAggressive; antagonistic.
3.AdjectiveUnwilling.
4.AdjectiveBeing or relating to a hostile takeover.
"Microsoft may go hostile in its bid for Yahoo! as soon as Friday, according to a published report."