adj. 25B6; adjective
an unfriendly look : HOSTILE, disagreeable, antagonistic, aggressive; ill-natured, unpleasant, surly, sour, unamicable, uncongenial; inhospitable, unneighbourly, unwelcoming, unkind, unsympathetic; unsociable, antisocial; aloof, cold, cool, frosty, distant, unapproachable; informal stand-offish, starchy.
unfriendly terrain : UNFAVOURABLE, disadvantageous, unpropitious, inauspicious, hostile.
amiable, favourable.