letho-, leth-
(Greek > Latin: lie hidden, secret; forgetfulness, forget, inactive through forgetfulness; also sleepy, drowsy, dull, sluggish)
When a person is lethargic, he or she is physically slow and mentally dull as a result of tiredness, disease, or drugs
2. The state of a person being drowsy and dull, listless, indifferent and lazy; apathetic or sluggish inaction: Jane didn't have any time for breakfast or lunch and fell into complete lethargy and fatigue in the afternoon.
3. Pathologically, an abnormal state of disorder characterized by overpowering drowsiness or sleep: Lethargy and a total lack of energy set in when the disease Mrs. Smith had became worse.
4. A situation of excessive fatigue or retardation, with diminished physical or mental activity: A person's lethargy might be a result of an organic disease or dysfunction of the nervous system or of a mental illness; such as, depression.
5. Etymology: From Late Latin lethargia, from Greek lethargia, "forgetfulness" from lethargos, "forgetful"; originally, "inactive through forgetfulness", from lethe, "forgetfulness" + argos, "idle".


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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 of the mind which overcame the souls who drank from this stream in the "Lower World".
2. Etymology: In Classical Greek, the word lethe literally means "oblivion", "forgetfulness", or "concealment".
The children pretended to drink from the mythological river Lethe, and acted as if they were in a Lethean state and not recalling who they were!
Related "sleep" units: dorm-; hypno-; narco-; oneiro- (dream); somni-; sopor-.
Etymologically related "forget, forgetfulness" word families: aletho-; oblivio-.
