Etymologically

lassus

Etymology and origin of the Latin word lassus

Confidence
Probable
Formation
Inherited
First attested
Plautus
Inherited from
Proto-Italic *lasso-
Ultimate origin
Proto-Indo-European (*leh₁d-)

Pronunciation

  • IPA (Classical): [ˈɫas.sʊs][1]
  • IPA (Ecclesiastical): [ˈlas.sus][1]

Forms

lassus (feminine lassa, neuter lassum, comparative lassior, superlative lassissimus); first/second-declension adjective[1]

Etymology

It is inherited from Proto-Italic *lasso-, inherited from Proto-Indo-European *lh₁d-to- (“tired”), a verbal adjective of the root Proto-Indo-European *leh₁d-, a d-enlargement of Proto-Indo-European *leh₁- (“to let”).[2][1] Cognate with Ancient Greek ληδεῖν (lēdeîn, “to be tired”) (in Hesychius), Albanian lodhem (“to be tired”), Gothic 𐌻𐌰𐍄𐍃 (lats, “slow”) and Gothic 𐌻𐌴𐍄𐌰𐌽 (lētan, “to let”).[2][3] Lewis & Short thought it a by-form of laxus.[4]

Earliest recorded meaning

In Plautus a character says he is tired from the voyage.[3][2] Köbler dates Plautus c. 250–184 BC.[5]

Semantic evolution

It was tired, weary or exhausted, mostly in poetry and post-Augustan prose, and poets used it of soil worn out by crops.[3][4] It also meant weary in mind, as in Plautus, worn out by love, and rēs lassae were misfortunes.[3] Döderlein says that fessus and fatīgātus describe a man who longs for rest from weariness he feels, lassus one who needs rest from real weakness after work.[6]

In medieval Latin it kept the sense “weary, tired of”.[7] It survives as Italian lasso, French las and Spanish laso.[1] English lassitude comes from its derivative lassitūdō, while English late is a Germanic cognate.[8]

Timeline

  • c. 250–184 BC – Plautus uses it.[3][5]
  • 43 BC–18 AD – Ovid speaks of soil growing old, tired from constant crops.[3][5]
  • early 15th century – English lassitude is recorded, from lassitūdō.[8]

Meanings

Adjective

  1. Tired, weary, exhausted.[3][4]
  2. Of soil or plants, worn out.[3]
  3. Weary in mind, sick at heart.[3]
  4. Rēs lassae, misfortune, distress.[3]

Word family

  • lassitūdō
  • lassō
  • lassulus
  • lassescō
  • lēnis
  • lētum
  • English lassitude
  • English late

References

  1. ^ a b c d e Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  3. ^ a b c d e f g h i j Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  4. ^ a b c Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  5. ^ a b c Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  6. ^ Döderlein, Ludwig (1874), Döderlein’s Hand-book of Latin Synonymes, tr. H. H. Arnold, Andover: W. F. Draper
  7. ^ Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press
  8. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com

Related etymologies

  • opus · also from Proto-Indo-European
  • albus · also from Proto-Indo-European
  • potis · also from Proto-Indo-European
  • salvus · also from Proto-Indo-European
  • socius · also from Proto-Indo-European
  • signum · also from Proto-Indo-European
  • frater · also from Proto-Indo-European
  • foedus · also from Proto-Indo-European
Cite this entry

“Lassus.” Etymologically, 16 Oct. 2026, etymologically.com/la/lassus. Accessed 16 Oct. 2026.

Last edited on . ·