hostile - noun

troops belonging to the enemy's military forces

hostile - adjective

• characterized by enmity or ill will
• not belonging to your own country's forces or those of an ally
• impossible to bring into friendly accord
• very unfavorable to life or growth
• unsolicited and resisted by the management of the target company ( used of attempts to buy or take control of a business)

hostile - thesaurus

uncongenial   unfriendly