From im- +‎ perfectus.



imperfectus (feminine imperfecta, neuter imperfectum, comparative imperfectior); first/second-declension adjective

  1. unfinished, incomplete
    Synonyms: incohātus, īnfectus
    Antonyms: complētus, absolūtus, perfectus, factus, dēfūnctus
  2. imperfect
  3. (grammar) imperfect


First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative imperfectus imperfecta imperfectum imperfectī imperfectae imperfecta
Genitive imperfectī imperfectae imperfectī imperfectōrum imperfectārum imperfectōrum
Dative imperfectō imperfectō imperfectīs
Accusative imperfectum imperfectam imperfectum imperfectōs imperfectās imperfecta
Ablative imperfectō imperfectā imperfectō imperfectīs
Vocative imperfecte imperfecta imperfectum imperfectī imperfectae imperfecta



  • imperfectus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • imperfectus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • imperfectus 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)
  • imperfectus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette
  • imperfectus in Ramminger, Johann (accessed 16 July 2016) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700[1], pre-publication website, 2005-2016