1.characterized by enmity or ill will;
a hostile nation
2.not belonging to your own country's forces or those of an ally;
hostile naval and air forces
3.very unfriendly;
a hostile attitude
4.impossible to bring into friendly accord;
hostile factions
5.very unfavorable to life or growth;
a hostile climate
6.marked by features that oppose constructive treatment or development;
not able to accomplish much in such a hostile environment
7.used of attempts to buy or take control of a business;
hostile takeover