The inability to feel mental pain.
A psychological condition where
mental/psychological pain, suffering, or distress isn't felt. Related to analgesia and anhedonia. In the most extreme cases of amensgonia a
person could be constantly
happy or in a constant state of mental neutrality.
Ex. "Rachel is such a nice girl, but she hardly ever seems unhappy about
anything."
"Well, she
might have amensgonia, she might not feel any mental pain at all."