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unfriendly; antagonistic:

«…に» 敵意［反感］を持った, 非友好的な(unfriendly) «to, toward»

e.g. a hostile audience

e.g. he wrote a ferociously hostile attack.

of or belonging to a military enemy:

比較なし 敵の, 敵性の, 交戦中の

e.g. hostile aircraft.

predicative opposed:

【考え･計画などに】断固反対で［の］ «to, toward» ; 相（あい）反する

e.g. people are very hostile to the idea.

(of a takeover bid) opposed by the company to be bought.

hostilely |ˈhästlˌlē, ˈhäˌstīlˌlē| adverb

late 16th century: from French, or from Latin hostilis, from hostis ‘stranger, enemy’.