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Alternative forms




From lētum (death; ruin) +‎ -ālis.





lētālis (neuter lētāle); third-declension two-termination adjective

  1. lethal, deadly, fatal, mortal
    Synonyms: capitālis, pestifer
    • c. 1129, Henricus Huntindoniensis, edited by Thomas Arnold, Historia Anglorum[1], published 1879, page 194:
      Quem cum bello caesum patri renuntiassent, ait: "Recepitne vulnus letale in anteriori vel posteriori corporis parte?" Dixerunt nuntii: "In anteriori."
      And when they had reported his death during the battle to his father, he said: "Did he receive the lethal blow on the front or the back of his body?" The messengers said: "In the front."
    • 2007, Carolus Petreius Bogotensis, Niponum gallinae probantur viru aviarii morbi contactae[2], Ephemeris:
      Biologici Nipones affirmant virus H5N1 {...} esse letale.
      Japanese biologists confirm that the H5N1 virus {...} is lethal.



Third-declension two-termination adjective.

Number Singular Plural
Case / Gender Masc./Fem. Neuter Masc./Fem. Neuter
Nominative lētālis lētāle lētālēs lētālia
Genitive lētālis lētālium
Dative lētālī lētālibus
Accusative lētālem lētāle lētālēs
Ablative lētālī lētālibus
Vocative lētālis lētāle lētālēs lētālia


  • Catalan: letal
  • English: lethal
  • French: létal
  • German: letal
  • Italian: letale
  • Portuguese: letal
  • Romanian: letal
  • Spanish: letal


  • letalis”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • letalis”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • letalis in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.