The Collaborative International Dictionary of English v.0.48:

Unhostile \Unhostile\
   See hostile.

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "unhostile":
   agreeable, amiable, amicable, brotherly, civilian, conciliatory,
   congenial, dovish, favorable, fraternal, friendlike, friendly,
   harmonious, irenic, kind, neighborlike, neighborly, nonaggressive,
   noncombatant, nonmilitant, nonviolent, pacific, pacifist,
   pacifistic, peace-loving, peaceable, pleasant, simpatico, sisterly,
   sociable, sympathique, unbellicose, uncontentious, unmilitant,
   unmilitary, well-affected, well-disposed, well-intentioned,
   well-meaning, well-meant