Etymologically

Etymology and origin of the Latin word infatuo

Confidence
Established
Formation
Derivation
First attested
81–43 BC, Cicero
Ultimate origin
Latin fatuus
Etymology tree
inherited borrowed derived
Latin fatuus
Latin infatuo

Pronunciation

  • Classical: [ĩːˈfa.tu.oː][1]
  • Ecclesiastical: [iɱˈfaː.tu.o][1]

Forms

īnfatuō (present infinitive īnfatuāre, perfect active īnfatuāvī, supine īnfatuātum); first conjugation[1]

Etymology

It is from Latin in- + fatuus (“foolish”), a verb in ⟨-āre⟩.[2][3] De Vaan tentatively derives fatuus from for (“to say”), through Proto-Italic *fatowo- (“of speech”): Fatuus was another name of the god Faunus, who foretold the future, and his name would then have come to be used disparagingly for “silly”.[4]

Earliest recorded meaning

The TLL finds it from Cicero on.[3] In the Philippics Cicero uses it of making fools of people with public pay, mercēde pūblicā.[5][6]

Semantic evolution

It means to make a fool of, to infatuate.[2][6] The Bellum Africum uses it of deluding with words, and Seneca writes that flattery makes a fool of everyone in his own measure.[5][6] The TLL notes that it becomes more frequent from the Itala on.[3]

In the Itala's version of Matthew it is used of salt that has lost its savour, sī sal infatuātum fuerit,[7] and Jerome too speaks of salt made tasteless.[6] The Vulgate uses it of turning a man's counsel to foolishness, and Jerome of a man besotted with the love of women.[5]

Timeline

  • 81–43 BC – Cicero uses it of fooling people with public pay.[5][8]
  • 4 BC–65 AD – Seneca uses it of the effect of flattery.[5][8]
  • after 220 AD – The Itala uses it of salt that has lost its taste.[7][8]
  • 390–406 AD – The Vulgate uses it of counsel turned to folly.[5][8]

Meanings

Verb

  1. To make a fool of, infatuate.[2][6]
  2. (Late Latin) To make insipid, deprive of taste.[6][7]
  3. (Late Latin) To turn counsel into folly.[5]

References

  1. ^ a b c Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  4. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  5. ^ a b c d e f g Georges, Karl Ernst (1913–1918), Ausführliches lateinisch-deutsches Handwörterbuch, 8th ed., ed. Heinrich Georges, Hannover; Leipzig: Hahn
  6. ^ a b c d e f Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  7. ^ a b c Conte, Gian Biagio; Pianezzola, Emilio; Ranucci, Giuliano (2010), il Latino: Vocabolario della lingua latina, 3rd ed., Florence: Le Monnier
  8. ^ a b c d Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
Cite this entry

“Infatuo.” Etymologically, 20 Oct. 2026, etymologically.com/la/infatuo. Accessed 23 Oct. 2026.

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