I have known one actual Habitual Liar.
The guy could not stop.....
lying sometimes for no reason at all.

You could stand there and watch it happening.

He was actually inventing his life wholesale in his mind.

You need a bug doctor to get in there & fix that up.

The bad guys are the ones who lie to-help-cheating.
They are actually Thieves & Sneaks & Cheaters...
more than liars.