antiself

adj

1. (not-comparable)Acting against the organism in which it occurs.

noun

1. An entity opposing or reflecting a self.

   “There could be whole antiworlds and antipeople made out of antiparticles. However, if you meet your antiself, don't shake hands!”

   “The Western movies, of course, are not cultural visions, but the vicious encounters with the antiselves of civilization, the invented savage.”