Not a word from their mouth can be trusted; their heart is filled with destruction.
Their throat is an open grave; with their tongue they speak deceit. Psalm 5:9
What is important to remember is that the Narcissist won't display just one or two of these traits--but ALL of them, all of the time.
The narcissist firmly believes he/she is more insightful and more enlightened than everyone else. Despite the fact that the narcissist may be a blatantly vindictive, bitter, hateful, resentful, vengeful, bigoted person at home in his/her own domain, the narcissist will spend every waking moment painting a different 'image' of him/herself, and obsessively looking for validation by ensuring that everyone in his/her sphere of influence accepts and believes in the phony image. If the narcissist's true image is exposed, he/she will often retaliate against the 'evil antichrist' who tarnished the narcissist's perfect phony image.
Backstabbing / Two-faced.