- The definition of lethargy is drowsiness or a lack of energy.
An example of lethargy is how someone would feel after taking a sedative.
- a condition of abnormal drowsiness or torpor
- a great lack of energy; sluggishness, dullness, apathy, etc.
Origin of lethargyMiddle English litarge ; from Old French ; from Late Latin lethargia ; from Classical Greek lēthargia ; from lēthargos, forgetful ; from lēthē (see Lethe) + argos, idle ; from a-, not + ergon, work
- a. A lack of energy or vigor; sluggishness.b. A lack of interest or enthusiasm; apathy: held a pep rally to shake the students out of their lethargy.
- Medicine An abnormal state of drowsiness, as caused by disease or drugs.
Origin of lethargyMiddle English letargie, from Old French, from Late Latin lēthārgia, from Greek lēthārgiā, from lēthārgos, forgetful : lēthē, forgetfulness + ārgos, idle (a-, without; see a–1 + ergon, work; see werg- in Indo-European roots).
(countable and uncountable, plural lethargies)
From Latin lÄ“thargia, from Ancient Greek Î»Î·Î¸Î±ÏÎ³Î¯Î± (lÄ“thargia, â€œdrowsinessâ€), from Î»Î®Î¸Î±ÏÎ³Î¿Ï‚ (lÄ“thargos, â€œforgetful, lethargicâ€), from Î»Î®Î¸Î· (lÄ“thÄ“, â€œforgetfulnessâ€) + á¼€ÏÎ³ÏŒÏ‚ (argos, â€œnot workingâ€).