ETYM Latin hostilis, from hostis enemy: cf. French hostile. Related to Host an army.
1. Very unfriendly.
2. Very unfavorable to life or growth; SYN. uncongenial, unfriendly.
3. Marked by features that oppose constructive treatment or development.
4. Impossible to bring into friendly accord.
5. Not belonging to one's own country's forces or those of an ally.
6. Characterized by enmity or ill will.
7. (Business) Used of attempts to buy or take control of a business.