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From in- (not) + sānus (healthy, sound).



īnsānus (feminine īnsāna, neuter īnsānum, comparative īnsānior, superlative īnsānissimus); first/second-declension adjective

  1. mad, insane, demented
    • c. 200 BCE – 190 BCE, Plautus, Captivi :
      Aristophontes: Quid tu autem? Etiam huic credis?
      Hegio: Quid ego credam huic?
      Aristophontes: Insanum esse me?
      Aristophontes: How’s this? You, too? Do you actually believe him?
      Hegio: Believe him in what?
      Aristophontes: That I’m insane?
    • c. 200 BCE – 190 BCE, Plautus, Captivi :
      Quid ais? Quid si adeam hunc insanum?
      See here, what if I should step up to this lunatic?


First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative īnsānus īnsāna īnsānum īnsānī īnsānae īnsāna
Genitive īnsānī īnsānae īnsānī īnsānōrum īnsānārum īnsānōrum
Dative īnsānō īnsānō īnsānīs
Accusative īnsānum īnsānam īnsānum īnsānōs īnsānās īnsāna
Ablative īnsānō īnsānā īnsānō īnsānīs
Vocative īnsāne īnsāna īnsānum īnsānī īnsānae īnsāna

Derived terms[edit]


  • Catalan: insà
  • English: insane
  • French: insane
  • Italian: insano
  • Portuguese: insano
  • Spanish: insano


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