1.Definition: characterized by enmity or ill will
"A hostile nation", "A hostile remark", "Hostile actions"
2.Definition: impossible to bring into friendly accord
3.Definition: not belonging to your own country's forces or those of an ally
"Hostile naval and air forces"
4.Definition: unsolicited and resisted by the management of the target company (used of attempts to buy or take control of a business)
"Hostile takeover", "Hostile tender offer", "Hostile bid"
5.Definition: very unfavorable to life or growth
"A hostile climate"