From Longman Business Dictionary
hostilehos·tile /ˈhɒstaɪlˈhɑːstl, ˈhɑːstaɪl/ adjectiveadjFINANCE a hostile BID or TAKEOVER is one in which a company tries to buy another company whose SHAREHOLDERs do not want to sellThey’ve managed to fight off a hostile takeover bid.