Etymologically

Etymology and origin of the Latin word iniustus

Confidence
Established
Formation
Derivation
First attested
c. 250–184 BC, Plautus
Ultimate origin
Proto-Indo-European (*h₂oi-u)

Pronunciation

  • Classical: [ɪnˈjuːs.tʊs][1]
  • Ecclesiastical: [inˈjus.tus][1]

Forms

iniūstus (feminine iniūsta, neuter iniūstum, comparative iniūstior); first/second-declension adjective[1] It is also spelled injūstus.[1]

Etymology

It is formed from in- (“not”) and iūstus (“just”).[2][3][4] De Vaan explains ⟨iūstus⟩ as a derivative in ⟨-to-⟩ of iūs (“law”), Proto-Italic *jowos (“oath, law”), an s-stem from Proto-Indo-European *h₂oi-u (“vital force, eternity”);[5] the old Latin form ⟨ious⟩ is found in inscriptions.[5] Cognate with Old Irish uisse (“just, fitting”).[5]

Earliest recorded meaning

Plautus has troops who trample the enemy forces, “rightly, as they are unjust”, in the Amphitruo;[2] Köbler also gives Plautus.[4]

Semantic evolution

Of people it is unjust or unfair, and of actions not in keeping with justice, as Terence's “how many unjust and wrong things are done by custom!”;[2][6] it is also undeserved, and of burdens unreasonably heavy, as Cicero's “an unfair load” and Livy's oppressive interest.[2][6] Of possession or marriage it is not recognised by law, as Livy's unlawful holders of public land.[2]

The TLL finds the comparative from Terence and the superlative from Cicero.[3] Church Latin glosses it “unjust, godless, unrighteous”.[7]

Timeline

  • c. 250–184 BC – Plautus of unjust enemies.[2][4]
  • 190–159 BC – Terence of unjust deeds; first comparative.[2][3][4]
  • 81–43 BC – Cicero of an unfair burden.[2][4]
  • 59 BC–17 AD – Livy of unlawful possessors.[2][4]

Meanings

Adjective

  1. Unjust, unfair;[2][6][1][7] (Ecclesiastical Latin) unrighteous.[7]
  2. Inequitable; undeserved; excessive, oppressive.[2][6][1]
  3. Not lawful, not recognised (possession, marriage).[2]

Word family

  • iniūstitia

References

  1. ^ a b c d e f Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  4. ^ a b c d e f Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  5. ^ 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
  6. ^ a b c d Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  7. ^ a b c Stelten, Leo F. (1995), Dictionary of Ecclesiastical Latin, Peabody, Mass.: Hendrickson
Cite this entry

“Iniustus.” Etymologically, 19 Oct. 2026, etymologically.com/la/iniustus. Accessed 19 Oct. 2026.

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