Difference between Lassitude and Lethargy

LASSITUDE vs LETHARGY: NOUN

Weakness characterized by a lack of vitality or energy
A state of comatose torpor (as found in sleeping sickness)
A state or feeling of weariness, diminished energy, or listlessness. : lethargy.
The state of having the energies weakened; weakness; weariness; languor of body or mind.
Synonyms Weariness, etc. See fatique.
A condition of the body, or mind, when its voluntary functions are performed with difficulty, and only by a strong exertion of the will; languor; debility; weariness.
Lethargy or lack of energy; fatigue.
Listlessness or languor.
A feeling of lack of interest or energy

A state of comatose torpor (as found in sleeping sickness)
Inactivity; showing an unusual lack of energy
Weakness characterized by a lack of vitality or energy
A lack of energy or vigor; sluggishness.
A lack of interest or enthusiasm; apathy.
An abnormal state of drowsiness, as caused by disease or drugs.
Same as litharge.
A state of prolonged inactivity or torpor; inertness of body or mind; sluggishness; dullness; stupor.
Specifically, in pathology, a disorder of consciousness, which consists of prolonged and profound sleep, from which the patient may be momentarily aroused, but into which he quickly sinks again.
The hibernation or winter sleep of an animal, or any other state of complete repose, as a period of summer lethargy observed in many insect-larvæ, the repose of many tropical animals during the dry season, etc.
Morbid drowsiness; continued or profound sleep, from which a person can scarcely be awaked.
A state of inaction or indifference.

Debility, Restlessness, Dullness, Apathy, Malaise, Torpor, Laziness, Indolence, Weariness, Ennui, Sluggishness, Inanition, Listlessness, Languor, Lethargy

Restlessness, Malaise, Tiredness, Torpor, Listlessness, Stalemate, Drowsiness, Ennui, Inertia, Stupor, Apathy, Inanition, Languor, Sluggishness, Lassitude

Debility, Restlessness, Dullness, Apathy, Malaise, Torpor, Laziness, Indolence, Weariness, Ennui, Sluggishness, Inanition, Listlessness, Languor, Lethargy

Weariness, Laziness, Restlessness, Malaise, Tiredness, Torpor, Listlessness, Drowsiness, Ennui, Stupor, Apathy, Inanition, Languor, Sluggishness, Lassitude

The patient passes into deep sleep and wakes with lassitude and impaired mental function.
Diabetes manifested as extreme thirst, excessive drinking, excessive food intake, profuse urination and lassitude.
Is lassitude and low attention span associated with worm infections and poor cognition?
Spiritual lassitude is a sin we have forgotten to tabulate nowadays, but the early Christians recognized it.
There, also, we bandaged up Fahad, who was sleepy with the lassitude of his severe hurt.
It breeds lassitude and indifference towards impracticable ideals, originally no less worthy than the practicable.
Lassitude, fatigue, anorexia, and decreased mental acuity often are the earliest manifestations of uremia.
In Europe, it was used for treatment of syncope, lassitude, and other problems.
Polydipsia, frequent and profuse urination, emaciation, aching pain in the lumbus, lassitude.
Then he had roused from his lassitude to anger.