Coming to the point, it is the letter 'o' which will tell you about the trustworthiness of the person even before the person opens his/her mouth.You will be well aware of the honesty of him/her.

If you see this, in 1 out of 10, then he is not a pathological liar, but does lie.
The picture below will explain things more clearly.
Other than revealing a person's characterstic of lying the letter 'o' tells more also.
- A closed 'o' will tell that the person is secretive.
- An 'o' open to the right handside is sincere.
- An 'o' open to the left handside is greedy.
I hope this learning will help you to meet fine people & keep unfaithful away.