IPA: /ˈhɒstɪli/
KK: /ˈhɑstɪli/
In a way that shows anger or dislike; unfriendly or aggressive.
The two countries spoke hostilely during the negotiations.
Hostilely → It is formed from "hostilis" (from Latin, meaning enemy or hostile) and the suffix "-ly" (meaning in a manner). The word "hostilely" means in a manner that is unfriendly or antagonistic, akin to the behavior of an enemy.
Think of 'hostilis' which relates to being an enemy, and remember that 'hostilely' means acting in an unfriendly or antagonistic way.