A person in between friend and acquaintance. You know them fairly well, but don't spend time with them outside of work, school, parties... You enjoy their presence, but are not inclined to become friends.
semi-friend bullshit friend
a•mee•gox•ik adjective
Definition:
A description of a poisonous friend, an acquaintance
who is detrimental to the well-being of another.
Friend1: "I don't understand why you still hang out with that girl. She's not very nice to other people."
Friend 2: "She's not mean to me, and we get along just fine."
Friend1: "Well, I don't like how she treats you, especially when she acts like she's better. I think she's amigoxic."