not amicable; not friendly or kindly in disposition; unsympathetic; aloof

an unfriendly coldness of manner.

hostile; antagonistic

an unfriendly act of aggression.

unfavorable; inhospitable or inimical, as an environment

an unfriendly climate for new ideas.

in an unfriendly manner.

adjective

approachable , friendly , kind , nice , sociable

adjective

acrimonious , against , alien , aloof , antagonistic , antisocial , censorious , chilly , cold , combative , competitive , conflicting , contrary , disaffected , disagreeable , distant , estranged , grouchy , grudging , gruff , hateful , ill-disposed , inauspicious , inhospitable , inimical , malicious , malignant , misanthropic , not on speaking terms , opposed , opposite , quarrelsome , sour , spiteful , surly , uncharitable , uncongenial , unfavorable , unneighborly , unpropitious , unsociable , vengeful , warlike , adverse , alienated , asocial , clannish , cliquish , cool , forbidding , frosty , hostile , malign , remote , standoffish , unamicable , unapproachable , ungracious , ungregarious , unsocial , unsympathetic , xenophobic