"Unbrother" is a informal term used to describe someone who disregards the bond of brotherly love or friendship, even though they are not necessarily blood-related. It implies that this person has disregarded or betrayed the trust and closeness associated with a brotherly relationship.
Xuan Li: I am unable to go to the club with you guys tonight.
Kevin: Its okay, i'm used to it, you're an unbrother
When a bro knows that a girl has a disease and doesn't run interference for another bro who is trying to get with her. This is usually done to spite another bro very few incidents of this are accidental.
Todd: Hey man don't you think we should warn Garret about her?
Mike: Nah, I think a little unbrotected sex is just perfect for him.
an unbothered queen is a person who doesn’t give a shit about what is happening around them. for example , two people can literally be fighting to the death and , that person watching wont care.