Narcissistic men have higher levels of stress hormone

[yardwork]

69. In my experience, narcissists spend a lot of time avoiding anything they don't like. Lying is a tool

I was starting to type "avoiding responsibility" and realized that that's wrong, the narcissists I know like responsibility if it's something that they chose. If they think of it as a tedious chore, they'll avoid it. In other words, it's all decided by whether or not they want to do something.

Being "nagged" or facing consequences for something is avoided at all costs, so you see where the lying comes in. If a lie will get somebody off their back and stop nagging them to do something they don't want to do, then the lie is used and there doesn't seem to be any sense of guilt or shame associated with it. If anything, the narcissist is proud of themselves for solving the problem.

As you know, narcissists aren't unpleasant all the time. They can be very charming. They can be generous and kind when they feel like it. But there's no trusting these traits because when the chips are down, the narcissist always pleases herself or himself.

What your brother said sounds true to me. He lies because lying works for him - it gets him out of situations that bore him or that he doesn't want to deal with.