not friendly
nasty, hostile
Cases of word usage
1) to cause (a person) to become unfriendly or indifferent (by unpopular or unpleasant actions) (alienate)
2) (of a person's character, expression) gloomy, serious and unfriendly (dour)
3) cold with frost; unfriendly (frosty)
4) being or appearing unfriendly (hostile)
5) an unfriendly feeling; hatred (hostility)
6) bad-tempered and unfriendly (surly)