If you dream of a living person whom you consider to be an adversary, you need to pay attention to the other symbols in the dream.
If they are warning symbols, this person may be actively working against you.
If they are positive, he or she may want a truce with you.
Dreaming of a shadowy, ominous, perhaps unseen enemy is calling your attention to your own shadow side.
A part of you is keeping you from attaining certain goals.
To deduce what part it is, look to other symbols in the dream.
Dreaming of several enemies is a dream of contrary.
It actually implies that you are surrounded by loving and loyal friends.