1. (a.) Not friendly; not kind or benevolent; hostile; as, an unfriendly neighbor.

2. (a.) Not favorable; not adapted to promote or support any object; as, weather unfriendly to health.

adversary adversative adverse aggressive alien allergic antagonistic anti antipathetic antithetic autistic averse bashful battling bellicose belligerent bloodthirsty bloody bloody-minded chauvinist chauvinistic chill chilly clashing close closed cold combative competitive con conflicting contentious contradictory contrary cool counter cross disaccordant disaffected disenchanted disinclined displeased dissentient dissociable enemy ferocious fierce fighting fractious frosty full of fight hawkish hostile icy ill incompatible inhospitable inimical insociable jingo jingoish jingoist jingoistic martial militant militaristic military mopey mopish morose negative noncooperative nongregarious not charmed obstinate offensive opponent opposed opposing opposite oppositional oppositive oppugnant overthwart perverse pugnacious put off quarrelsome recalcitrant refractory repugnant rival saber-rattling sanguinary sanguineous savage scrappy self-contained self-sufficient snug socially incompatible soldierlike soldierly strained sullen tense trigger-happy truculent unamiable unamicable unclubbable uncommunicative uncompanionable uncongenial uncooperative uncordial unfavorable ungenial ungracious unharmonious unhospitable unneighborly unpacific unpeaceable unpeaceful unpropitious unreceptive unsociable unsocial warlike warmongering warring