When I'm referring to malignant narcissists, I often use the term "personality disordered." But a more accurate description is "morally disordered." That's because these people appear to operate without a normal moral compass, yet they are fully aware of what they are doing. They aren't crazy or out of touch with reality, or at least their own version of it. They knowingly, and with the full use of reason, select a particular target for destruction.
They ruin reputations, relationships and even livelihoods with impunity. They don't appear to suffer any interior turmoil because of their behavior.
Everything they do to harm someone else is a choice. They also have sufficient time to reflect upon their actions, because bringing another person down requires a lot of advance planning and manipulation of everyone else in the environment. This all reflects an underlying lack of morals.
So I'm going to try to use the phrase "morally disordered" a lot more when describing the antics of a malignant narcissist. I believe it this term is the better one, because it forces a level of accountability. Personality disorder, in a way, lets them off the hook, as it implies that this is just the way they are, and that they can't help themselves.
The damage these morally disordered folks can cause borders on they surreal. Until you've lived through narcissistic abuse, you probably can't comprehend this type of evil. If you're involved with a female narcissist, and she pretends to be your "friend," please rethink the relationship. Life will be much better when you cut her loose.