A woman (or man) who isn't interested in a guy who's chatting her (him) up.
That chick is so unfriendly she won't go out with me even though I've asked her like 8 times.
Tries to shoot you with a bow and arrow
Lewis: He wasn't very friendly, he was rather agressive to us.
Simon: I know! He tried to murder us, didn't he? That's sort of the definition of unfriendly: "Tries to kill you with a bow and arrow".