What is the word legathargy describing

Lethargy - the correct written form.

Explanation:

Lethargy is a state of lack of willpower, strength - condition opposite from how an organism should function. It also means a state of fatigue, lack of will to live, less physical activity. In addition to lethargy, depression and poor mental health can also occur.

Some persons are naturally lethargic, therefore quiet, slow, calm withdrawn.

In cases where lethargy is a condition, it can be improved by resting, sleeping and positive thinking.