Etymology and origin of the Latin word indefessus
- Confidence
- Established
- Formation
- Derivation
- First attested
- 70–19 BC, Virgil
- Ultimate origin
- Latin dēfetīscor
Forms
indēfessus (feminine indēfessa, neuter indēfessum, adverb indēfessē or indēfessim); first/second-declension adjective[1]
Etymology
It is from Latin in- (“not”) + dēfessus (“worn out”).[2][1][3] The participle dēfessus belongs to dēfetīscor (“to grow weary”),[2] which Köbler traces to dē- and fatīscor.[4]
Earliest recorded meaning
Virgil is the first to use it, in the Aeneid, of a tireless right hand.[5][6][4]
Semantic evolution
It is a word of poetry and post-Augustan prose.[5] Ovid sets it against its opposite: Jupiter's wife is dēfessa iubendō, tired of giving orders, while the speaker is indēfessus agendō, tireless in carrying them out.[7][6] Tacitus pairs it with assiduus, diligent,[5] and Apuleius has unceasing grief, indēfessus lūctus.[6] Late writers made the adverbs indēfessē and indēfessim, unweariedly.[5]
In the Middle Ages it was used of tireless servants of Christ and soldiers of God, and of unceasing zeal, care or prayer;[8][9] Bede writes of tireless perseverance.[9] It could also mean everlasting or indissoluble.[8]
Timeline
- 70–19 BC – Virgil uses it of a tireless hand.[5][4]
- 43 BC–18 AD – Ovid contrasts indēfessus with dēfessa.[7][4]
- 98–115 AD – Tacitus pairs it with assiduus.[5][4]
- c. 125–175 AD – Apuleius uses it of unceasing grief.[6][4]
- 639–709 AD – Aldhelm calls virginity a tireless companion.[9][4]
Meanings
Adjective
- Tireless, unwearied, indefatigable.[2][5]
- Unceasing, continual.[6]
- (Medieval Latin) Everlasting, indissoluble.[8]
References
- ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
- ^ a b c Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
- ^ Bianchi, Rossella; Lelli, Olga (2014), VOLI: Vocabolario di latino, Florence: Le Monnier
- ^ a b c d e f g Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
- ^ a b c d e f g Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
- ^ a b c d e Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
- ^ a b Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
- ^ a b c Mittellateinisches Wörterbuch bis zum ausgehenden 13. Jahrhundert (1967–), Munich: C. H. Beck; Bayerische Akademie der Wissenschaften
- ^ a b c 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
Cite this entry
“Indefessus.” Etymologically, 20 Oct. 2026, etymologically.com/la/indefessus. Accessed 23 Oct. 2026.
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