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Definition of lethargy

lethargy

/ˈlɛθ.əɹ.dʒi/
leth · ar · gy
Adverb:lethargically
•
Plural:lethargies
•
Adjective:lethargic
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lethargy Lexical Profile

lethargy Game Scores & Validity

• noun

1

A state of sluggishness, physical fatigue, and lack of energy or enthusiasm.

Example

"The oppressive summer humidity brought a wave of lethargy over the entire office."

2

A pathological state of prolonged sleepiness, deep unresponsiveness, and muscular inactivity caused by illness, injury, or medication.

Example

"Persistent fever and severe lethargy are warning signs that require immediate medical evaluation."

Synonyms
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Antonyms
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• Nearby Words

lethally
lethargic
lethargically
lethargy
letter
letterbox
lettered

Word Origin & Etymology

Borrowed in the late 14th century via Old French and Late Latin from Ancient Greek 'lethargia' ('drowsiness'), derived from 'lethe' ('forgetfulness', also the mythical river of oblivion in Hades) and 'argos' ('idle' or 'inactive').

Cite this Entry

Wordmom. (2026). Definition of Lethargy. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/lethargy
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