Bad / Unfriendly
unforgiving - Not making an allowance for error or weakness in others; not willing to forgive others for things they might have done wrong.

Because they knew that Alaska in the winter is an unforgiving environment, they had to plan their expedition very carefully.
shun - To persistently avoid, ignore, or reject (someone or something) through antipathy or caution

When David tried to join in the conversation at the club, they ignored him, and he suspected that he was being shunned because he had a different religion than they did.