Source : Webster's Revised Unabridged Dictionary (1913)

Hostile \Hos"tile\, a. [L. hostilis, from hostis enemy: cf. F.
   hostile. See {Host} an army.]
   Belonging or appropriate to an enemy; showing the disposition
   of an enemy; showing ill will and malevolence, or a desire to
   thwart and injure; occupied by an enemy or enemies; inimical;
   unfriendly; as, a hostile force; hostile intentions; a
   hostile country; hostile to a sudden change.

   Syn: Warlike; inimical; unfriendly; antagonistic; opposed;
        adverse; opposite; contrary; repugnant.

Hostile \Hos"tile\, n.
   An enemy; esp., an American Indian in arms against the
   whites; -- commonly in the plural. [Colloq.] --P. H.
   Sheridan.

Source : WordNet®

hostile
     adj 1: characterized by enmity or ill will; "a hostile nation"; "a
            hostile remark"; "hostile actions" [ant: {amicable}]
     2: not belonging to your own country's forces or those of an
        ally; "hostile naval and air forces" [ant: {friendly}]
     3: very unfriendly; "a hostile attitude"
     4: impossible to bring into friendly accord; "hostile factions"
     5: very unfavorable to life or growth; "a hostile climate"; "an
        uncongenial atmosphere"; "an uncongenial soil"; "the
        unfriendly environment at high altitudes" [syn: {uncongenial},
         {unfriendly}]
     6: marked by features that oppose constructive treatment or
        development; "not able to accomplish much in such a
        hostile environment"
     7: used of attempts to buy or take control of a business;
        "hostile takeover"; "hostile tender offer"