Not sure if this applies more to NPD or ASPD. But here goes nothing...
Ever since I was a child my father used to say I was a hypocrit, a trickster and more recently, an actor. It's probably true. I have been accused of being disingenuous by quite a few people in my life.
As far as I know I never express my true feelings on thibgs and always tend to process my emotions before "expressing" i. I don't think I go around trying to deliberately dupe people but at this point I assume it's something deeply entrenched in my personality.
If I was to guess, being in an abusive environment with abusive parents who were willing to use violence against you if you expressed yourself may have something to do with it. When I was 5 I refused to see a picture my father was trying to show me. So he pushed me to the ground, kicked me in the ass and called me a "son of a whore". From then on I understood that expressing your genuine personality or wishes could lead to severe consequences. I mean I dont comply with people's wishes in the schizoid slavish sense. I know when to say "no". However, regardless of what I decide to do I never let the person know what I'm thinking or planning which makes some people suspicious. At this point it's not out of fear of conflict but simply an engrained mechanism. I do get into conflicts with people, even readily actually...
How common is hypocrisy in NPD? Is it something most pwNPD have?