See also: justus and Justus



Alternative forms




From Old Latin iovestos, from Proto-Italic *jowestos, from Proto-Indo-European *h₂yew-. By surface analysis, iūs +‎ -tus.





iūstus (feminine iūsta, neuter iūstum, comparative iūstior, superlative iūstissimus); first/second-declension adjective

  1. just, righteous
  2. lawful, legal
    Synonym: lēgitimus
  3. justified, merited, well-deserved, due
    • 27 BCE – 25 BCE, Titus Livius, Ab Urbe Condita 26.1:
      Ea tum cura maxime intentos habebat Romanos, non ab ira tantum, quae in nullam unquam ciuitatem iustior fuit, quam quod urbs tam nobilis ac potens, sicut defectione sua traxerat aliquot populos, ita recepta inclinatura rursus animos uidebatur ad ueteris imperii respectum.
      This concern in particular troubled the mindful Romans at the time, not so much because of anger, which has never been more justified against any other city, rather because a city so noble and powerful, in the same way that it had attracted the support of a number of communities by its revolt, was thought would again turn attention back towards respect for the previous government once recaptured.
  4. proper, perfect, complete, reasonable, suitable, sufficient
    Synonyms: opportūnus, commodus, habilis, aptus, idōneus, dignus, conveniēns, lēgitimus, ūtilis
    Antonyms: incommodus, inūtilis, ineptus, irritus, grātuītus
  5. (figurative) exact, straight, direct



First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative iūstus iūsta iūstum iūstī iūstae iūsta
Genitive iūstī iūstae iūstī iūstōrum iūstārum iūstōrum
Dative iūstō iūstō iūstīs
Accusative iūstum iūstam iūstum iūstōs iūstās iūsta
Ablative iūstō iūstā iūstō iūstīs
Vocative iūste iūsta iūstum iūstī iūstae iūsta

Derived terms



  • Eastern Romance
    • Aromanian: giustu (perhaps borrowed, either directly or through an intermediate language)
  • Gallo-Italic
  • Italo-Dalmatian
  • Old French: juste
    • French: juste
    • Norman: juste
    • Middle Dutch: juust
      • Dutch: juist (see there for further descendants)
    • Middle English: juste (see there for further descendants)
  • Old Occitan:
  • Rhaeto-Romance
  • Sardinian: giustu, zustu
  • Venetian: justo, xusto, giusto, giust
  • West Iberian


  • justus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • iustus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • iustus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
  • iustus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
  • Carl Meißner, Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to perform the last rites for a person: iusta facere, solvere alicui
    • to be deprived of the rites of burial: iustis exsequiarum carere
    • for valid reasons: iustis de causis
    • soldiers collected in haste; irregulars: milites tumultuarii (opp. exercitus iustus) (Liv. 35. 2)
    • a regular, formal war: bellum iustum (pium)
    • a pitched battle: proelium iustum (opp. tumultuarium)
    • to fight a pitched, orderly battle with an enemy: iusto (opp. tumultuario) proelio confligere cum hoste (Liv. 35. 4)
    • with perfect right: iusto iure
  • iustus”, in Harry Thurston Peck, editor (1898), Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers