Etymologically

monstruosus

Etymology and origin of the Latin word monstruosus

Confidence
Established
Formation
Derivation
First attested
81–43 BC, Cicero
Ultimate origin
Latin mōnstrum
Etymology tree
inherited borrowed derived
Latin monstrum
French monstre
Italian mostro
Latin monstruosus

Pronunciation

  • Classical: [mõː.struˈoː.sʊs][1]
  • Ecclesiastical: [mon.struˈɔː.s̬us][1]

Forms

mōnstruōsus (feminine mōnstruōsa, neuter mōnstruōsum); first/second-declension adjective[1] Also spelled mōnstrōsus.[2][3] The TLL finds the longer form the more usual, and the shorter the only reading in a few places, such as a passage of Seneca;[3] Lewis & Short call the shorter form post-classical.[4]

Etymology

It is from Latin mōnstrum (“portent, monster”) + -ōsus.[2][3][1] The TLL compares portentōsus, formed in the same way from a word for an omen.[3]

Earliest recorded meaning

Cicero is the first to use it, in On Divination, where he calls the ape illam mōnstruōsissimam bestiam, “that most unnatural beast”.[2][4][5] In the same work he has the adverb mōnstruōsē “in an unnatural way”.[4]

Semantic evolution

Its first sense is of what is portentous or ill-omened, but it is mostly used of what goes against nature: deformed births,[2][6] mutilated bodies and strange diseases in Seneca,[6] unnatural lusts in Suetonius.[4][6] It also came to mean simply strange or astonishing: Petronius has a dish longē mōnstruōsius “far more extraordinary”,[4] Suetonius calls a grammarian mōnstruōsus vītā scrīptīsque,[4] and Macrobius speaks of a pearl of monstrous size.[6]

Medieval writers used it of abnormal births and of anything contrary to the natural order,[7] and of monsters themselves, such as a sea beast.[7] English took ⟨monstruous⟩ in the late 14th century, through Old French and directly from Late Latin; ⟨monstrous⟩ followed in the mid-15th century.[8]

Timeline

  • 81–43 BC – Cicero calls the ape a most unnatural beast.[2][4][5]
  • 4 BC–65 AD – Seneca uses it of deformed bodies and diseases.[6][5]
  • before 66 AD – Petronius uses the comparative of a dish at a banquet.[4][5]
  • c. 75–c. 150 AD – Suetonius uses it of unnatural lusts and of a strange life.[4][6][5]
  • 1st half of the 5th century AD – Macrobius speaks of a pearl of monstrous size.[6][5]
  • late 14th century – English borrows it as ⟨monstruous⟩.[8]

Meanings

Adjective

  1. Portentous, ill-omened.[2]
  2. Against nature, unnatural, monstrous.[2][4][6]
  3. Strange, extraordinary.[6][4]
  4. (Medieval Latin) Of or like a monster.[7]

Word family

  • monstrositas

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c d Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  4. ^ a b c d e f g h i j k Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  5. ^ a b c d e f Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  6. ^ a b c d e f g h i Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  7. ^ a b c Latham, R. E., D. R. Howlett, R. K. Ashdowne, et al. (1975–2013), Dictionary of Medieval Latin from British Sources, London: British Academy / Oxford University Press
  8. ^ a b Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
Cite this entry

“Monstruosus.” Etymologically, 23 Oct. 2026, etymologically.com/la/monstruosus. Accessed 23 Oct. 2026.

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