Etymologically

Etymology and origin of the French word impropre

Confidence
Established
Formation
Borrowing
First attested
1372 Jean Corbichon, translation of the Propriétés des choses More words from the 14th century
Borrowed from
Latin improprius
Ultimate origin
Latin proprius
Etymology tree
inherited borrowed derived
Latin proprius
French propre
Italian proprio
Romanian propriu
Spanish propio
Latin improprius
French impropre
English improper
From the same root
English proper ← proprius
Latin appropriō ← proprius
Latin propriē ← proprius
Latin proprietās ← proprius
Latin propriō ← proprius

Pronunciation

  • /ɛ̃.pʁɔpʁ/[1]

Forms

impropre (plural impropres)[1]

Etymology

It is borrowed from Late Latin improprius (“not fitting”), a term of the Latin grammarians,[2][3][4] formed from in- (“not”) and proprius (“one's own, special, proper”).[5][6][7] The TLFi dates the borrowing to 1372.[2][8] The sense “unfit for”, construed with ⟨à⟩, was shaped by the French adjective propre.[2]

Cognate with Old Occitan impropri, Italian improprio and Spanish impropio.[7]

Earliest recorded meaning

It is first found in 1372, in Jean Corbichon's translation of the Propriétés des choses (in a 15th-century manuscript), in the phrase impropre manière de parler, of a way of speaking that does not express the idea exactly.[2]

Semantic evolution

The adjective first qualified a word or expression that does not suit what it names, as Latin improprius did in grammar.[4][2] In 1676 Bouhours records impropre à, of a thing that does not lend itself to a use, and the construction passed into common usage as the opposite of propre à;[2][4] from 1804 it is also said of a person unfit for a task.[2]

Grammar kept the older sense in diphtongue impropre (1867, Littré), a vowel digraph that is a diphthong only to the eye,[5][7] and in dérivation impropre (1893), the change of a word's function without a change of form.[5][4] Rey notes that the adjective answers only to the first sense of propre: the opposite of propre “clean” is malpropre or sale.[4]

Timeline

  • 1372 – Corbichon writes impropre manière de parler.[2][5]
  • 16th century – Calvin and Amyot use the word of improper wording.[7]
  • 1676 – Bouhours records impropre à “unsuited to”.[2][4]
  • 1804 – Benjamin Constant uses it of a person unfit for a task.[2]
  • 1867 – Littré records diphtongue impropre.[5]
  • 1893 – The Dictionnaire général records dérivation impropre.[5][4]

Meanings

Adjective

  1. Of a word or expression: not fitting, not expressing the idea exactly; incorrect.[9][2][10]
  2. Impropre à: of a person, unfit for a task or service, il a été jugé impropre au service.[9][11][10]
  3. Impropre à: of a thing, unsuitable for a use, as food impropre à la consommation “unfit for consumption”.[9][10]
  4. (grammar) Dérivation impropre: the use of a word in a new function without a change of form, also called conversion.[5][4]

Word family

  • improprement

References

  1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k Trésor de la langue française informatisé (2004), ATILF – CNRS & Université de Lorraine, atilf.fr/tlfi; electronic version of Imbs, Paul; Quemada, Bernard, eds. (1971–1994), Trésor de la langue française, Paris: CNRS / Gallimard
  3. ^ Bloch, Oscar; Wartburg, Walther von (1989), Dictionnaire étymologique de la langue française, 8th ed., Paris: Presses universitaires de France
  4. ^ a b c d e f g h Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  5. ^ a b c d e f g Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse
  6. ^ Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  7. ^ a b c d Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette
  8. ^ Wartburg, Walther von, et al. (1922–2002), Französisches Etymologisches Wörterbuch, 25 vols., Bonn / Leipzig / Basel: Klopp / Teubner / Zbinden, p. 4, 608b
  9. ^ a b c Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert
  10. ^ a b c Dictionnaire de français Larousse, larousse.fr/dictionnaires/francais (accessed 2024)
  11. ^ Dictionnaire Le Robert en ligne, dictionnaire.lerobert.com (accessed 2024)

Related etymologies

Cite this entry

“Impropre.” Etymologically, 14 Nov. 2026, etymologically.com/fr/impropre. Accessed 15 Nov. 2026.

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