Rebonjour
"Mortal enemies" are more likely to wish death upon one another than might be "intimate" ones, who would, rather, have an indeed "romantique" stance, in the literary sense, whereby each would retain une rancune against the other, each would be a sort of trembling volcano with regard to others' commentaries concerning the ennemi. In politics, such people detest the power and the privilege granted the other. Extremely so... but not so that the one would wish the death of the other, je crois. Intimate enemies would know the intimate details, one of the other's life and loves; mortal enemies would have a walled-in grudge that would barricade them from such awareness of intimacy...