The word I think you’re looking for is ‘Truth’. Honesty.
Because an actor who is portraying somebody is being ‘true’ to that character, to that role, to that person. You know, they are portraying them as truthfully as they can.
When I’m talking about a product that I’m selling, and I’m passionate about it, and I’m truthful then the audience will see that and they’ll feel that, and appreciate that.
If you’ve got a lack of truth then you will push people away. People can smell it, you can feel it. Children can smell it, and a lot of adults know how to smell it as well.
If you lack truth then you’ll definitely push people away. If you have truth you’ve got a good chance of keeping them there.