unfriendly
un-friend-ly
adjective
Not kind, pleasant, or welcoming; showing dislike or hostility towards others.
"The new dog seemed quite unfriendly."
Thesaurus
Synonyms: scowling, uncordial, chilly, unneighbourly, unneighborly, beetle-browed, inhospitable, hostile, uncongenial, inimical
Antonyms: friendly