Etymologically

lethargus

Etymology and origin of the Latin word lethargus

Confidence
Established
Formation
Borrowing
First attested
65–8 BC, Horace
Borrowed from
Ancient Greek λήθαργος
Ultimate origin
Ancient Greek λήθαργος
Etymology tree
inherited borrowed derived
Ancient Greek λήθαργος
Latin lethargus
From the same root
English lethargy ← λήθαργος

Pronunciation

  • Classical: [ɫeːˈtʰaːr.ɡʊs][1]
  • Ecclesiastical: [leˈtar.ɡus][1]

Forms

lēthārgus m (genitive lēthārgī); second declension[1]

Etymology

It is borrowed from Ancient Greek λήθαργος (lḗthargos, “forgetful; drowsy”).[2][1][3][4] Köbler analyses the Greek word as λήθη (lḗthē, “forgetting”) and ἀργός (argós, “idle”),[3] and Etymonline explains it as “idle through forgetfulness”.[5]

Earliest recorded meaning

Its first author is Horace, who in the Satires tells of a man in the grip of a heavy lethargy.[4][6][3]

Semantic evolution

The OLD treats an adjective, lethargic, and a noun of medicine, lethargy, made from it.[2] Pliny the Elder has morbus lēthargus, the lethargic disease,[4][6] Celsus writes the word in Greek,[4] and Servius Sulpicius, quoted by Quintilian, uses the noun in the singular and plural.[6] Caelius Aurelianus uses it of the patient, a person suffering from lethargy.[6] Stelten keeps the adjective, drowsy or lethargic, for Ecclesiastical Latin.[7]

Timeline

  • 65–8 BC – Horace uses it in the Satires.[4][6][3]
  • 23/24–79 AD – Pliny the Elder speaks of morbus lēthargus.[4][6][3]
  • 5th century AD – Caelius Aurelianus uses it of the patient.[6][3]
  • c. 950 – Köbler records it again from a British source.[3]

Meanings

Adjective

  1. lethargic, drowsy.[2][4][7]

Noun

  1. (medicine) lethargy, a disease of heavy drowsiness.[2][4][1]
  2. A person suffering from lethargy.[6]

Word family

References

  1. ^ a b c d e Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d e f g Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  4. ^ a b c d e f g h Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  5. ^ Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  6. ^ a b c d e f g h Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  7. ^ a b Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson

Related etymologies

Cite this entry

“Lethargus.” Etymologically, 23 Oct. 2026, etymologically.com/la/lethargus. Accessed 23 Oct. 2026.

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