Ok, semantics, but here goes.
I am working from the conceptualization of [untranslatable in sufficient detail, roughly: family > clan > ally > rival > outsider > enemy], where to be a [rival; opponent; competitor] there needs to be some common ground or interest to begin with. An [outsider; neutral; unknown] is neutral to that common interest, an [enemy; devil; abomination] is actively working to destroy it.