2.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 country"
3.adjectiveAggressive, antagonistic.
4.adjectiveUnwilling
5.adjectiveOf a hostile takeover.
"Microsoft may go hostile in its bid for Yahoo as soon as Friday, according to a published report."