Mental
Part of speech: adjective
Definition: of or relating to the mind or an intellectual process of or relating to the chin or median part of the lower jaw, genial of or relating to the chin-like or lip-like structure of or pertaining to a crazy person, crazy
Example sentence: True prayer is neither a mere mental exercise nor a vocal performance. It is far deeper than that - it is spiritual transaction with the Creator of Heaven and Earth.
Psychological
Part of speech: adjective
Definition: Of or pertaining to psychology.
Example sentence: I have a lot of scars, man. My mother said that a man is not a man unless he has a scar on his face. And what she meant by a scar was some kind of battle that you had to go through, whether it was psychological or physical. To her, a scar was actually beautiful and not something that marred you.