letho-, leth- +

An incapacity to forget past events.

1. Physically slow and mentally dull as a result of tiredness, disease, or drugs.
2. Causing a state of physical slowness and mental dullness.
3. Causing, or characterized by lethargy; lazy, indolent, torpid.

1. Pertaining to, affected with, or resembling, lethargy; morbidly drowsy; dull; heavy.
2. Affected with, or producing, lethargy; drowsy; sluggish.

1. Without energy; in a lethargic manner.
2. Descriptive of being lazy, indolent, and torpid.

1. To make lethargic; to stupefy.
2. To bring into a state of lethargy.

1. Producing lethargy.
2. A drug or agent that produces lethargy.

Sleeping sickness; specifically, the African variety.

1. A state of comatose torpor (as found in sleeping sickness).
2. Inactivity; showing an unusual lack of energy.
3. Weakness characterized by a lack of vitality or energy.
4. The quality or state of being drowsy and dull, listless and unenergetic, or indifferent and lazy; apathetic or sluggish inactivity.
5. Pathologically, an abnormal state or disorder characterized by overpowering drowsiness or sleep.
6. A state of excessive fatigue or retardation, with diminished physical or mental activity.

This condition might be a result of an organic disease or dysfunction of the nervous system or of a mental illness; such as, depression.

7. Etymology: From Late Latin lethargia, from Greek lethargia, "forgetfulness" from lethargos, "forgetful"; originally, "inactive through forgetfulness", from lethe, "forgetfulness" + argos, "idle".

River of forgetfulness.

One of the five rivers of Hades. Others were the Acheron, the Cocytus, the Phlegethon, and the Styx.

Those who drank from the River Lethe immediately forgot everything that had happened to them.

The expression "waters of Lethe" or the word lethean has been used to imply forgetfulness and complete oblivion which overcame the souls who drank from this stream in the "Lower World".

1. Total loss of memory.
2. Oblivion, forgetfulness.

Inducing forgetfulness or oblivion with reference to the River Lethe; in effect, like the water of Lethe.

The effects of forgotten experiences on present behavior.

An abnormal craving for forgetfulness.

1. A tendency to be forgetful.
2. A condition in which someone forgets.

The inability to recall a word or the right word.