* Asthenia: Weakness, lack of strength.
* Hypersthenia: Excessive strength or power.
* Neurasthenia: A nervous condition characterized by fatigue, weakness, and irritability.
* Myasthenia: Muscle weakness.
* Akinesthesia: Lack of voluntary movement.
* Dysesthesia: A disorder of sensation characterized by abnormal or unpleasant sensations.
These are just a few examples, and there are other words that use "-sthenia" as a suffix. You can find more by searching for medical dictionaries or online resources.