Definition of "Hostile" :

noun: troops belonging to the enemy's military forces

"The platoon ran into a pack of hostiles."

adjective: unsolicited and resisted by the management of the target company (used of attempts to buy or take control of a business)

"Hostile takeover."

adjective: not belonging to your own country's forces or those of an ally

"Hostile naval and air forces."

adjective: very unfavorable to life or growth

"A hostile climate."

adjective: characterized by enmity or ill will

"A hostile nation."

adjective: impossible to bring into friendly accord

"Hostile factions."