1.Definition: characterized by enmity or ill will

"A hostile nation", "A hostile remark", "Hostile actions"

2.Definition: impossible to bring into friendly accord

"Hostile factions"

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"

Related Adjective(s):uncongenial, unfriendly