Etymologically

imbecillitas

Etymology and origin of the Latin word imbecillitas

Confidence
Established
Formation
Derivation
First attested
2nd half of the 2nd century BC, Afranius
Ultimate origin
Latin (imbēcillus)
Etymology tree
inherited borrowed derived
Latin imbecillus
English imbecile
French imbécile
Latin imbecillitas

Forms

imbēcillitās f (genitive imbēcillitātis); third declension[1] It is also spelled inb-.[2][3]

Etymology

It is from Latin imbēcillus (“weak, feeble”) + -tās.[2][4] De Vaan finds no etymology for ⟨imbēcillus⟩: the old explanation “without a walking stick”, after a scholion on Juvenal, makes little sense, and Ernout and Meillet's ⟨*imbeccillus⟩ is far-fetched.[5][1] Etymonline reports the traditional derivation from in- (“not”) and baculum (“stick”).[6]

Earliest recorded meaning

Köbler's first source is the comic poet Afranius;[7] the OLD's earliest example is the Rhetorica ad Herennium.[2]

Semantic evolution

It is bodily weakness, especially from illness: Cicero writes that his daughter's illness and weakness are killing him.[2][3] It is used of weak faculties such as sight, and of fragile things, as Cicero's undecked Rhodian ships.[2] It is also weakness of mind or character, and powerlessness, the inability to defend oneself, as Cicero's weakness of the country towns; it was regarded as typical of women and of the young.[2]

English imbecility (early 15th century) at first meant physical weakness.[6]

Timeline

  • 2nd half of the 2nd century BC – Afranius.[7]
  • 86/82 BC – the Rhetorica ad Herennium of bodily weakness.[2][7]
  • 81–43 BC – Cicero of illness, weak ships and weak towns.[2][7]
  • early 15th century – English imbecility.[6]

Meanings

Noun

  1. Physical weakness, feebleness; weakness from illness; weakness of the senses.[2][3][1]
  2. Weakness of materials, fragility.[2]
  3. Moral or intellectual weakness.[2]
  4. Powerlessness, helplessness.[2][1]

Usage notes

Döderlein contrasts ⟨validus⟩, strong and able to act, with imbēcillus, its opposite.[8]

References

  1. ^ a b c d Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  3. ^ a b c Lewis, Charlton T.; Short, Charles (1879), A Latin Dictionary, Oxford: Clarendon Press
  4. ^ Thesaurus linguae Latinae (1900–), Leipzig: Teubner; Berlin: De Gruyter; open-access ed., Munich: Bayerische Akademie der Wissenschaften
  5. ^ de Vaan, Michiel (2008), Etymological Dictionary of Latin and the other Italic Languages, Leiden Indo-European Etymological Dictionary Series 7, Leiden; Boston: Brill
  6. ^ a b c Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  7. ^ a b c d Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  8. ^ Döderlein, Ludwig (1874), Döderlein’s Hand-book of Latin Synonymes, tr. H. H. Arnold, Andover: W. F. Draper
Cite this entry

“Imbecillitas.” Etymologically, 19 Oct. 2026, etymologically.com/la/imbecillitas. Accessed 20 Oct. 2026.

Last edited on . ·