Etymologically

impossible

Etymology and origin of the French word impossible

Confidence
Established
Formation
Borrowing
First attested
c. 1227, Guillaume le Clerc, Besant de Dieu
Borrowed from
Latin impossibilis
Ultimate origin
Latin (possum)
Etymology tree
inherited borrowed derived
Latin potis
Latin possum
Latin possibilis
English possible
French possible
English impossible
French impossible

Pronunciation

  • IPA: /ɛ̃.pɔ.sibl/[1]

Forms

impossible (plural impossibles)[1]

Etymology

It is borrowed from Latin impossibilis (“that cannot be or be done, (Late Latin) unable”), formed with the negative prefix in- on possibilis (“possible”) (compare possible), from possum (“to be able”).[2][3][4][5][6] Wiktionary analyses it within French as “im-” and “possible”.[1]

Cognate with Old Occitan impossible, Spanish imposible, Portuguese impossível and Italian impossibile.[7]

Earliest recorded meaning

In Guillaume le Clerc's Besant de Dieu (about 1227) chose impossible is a thing that cannot be or be done.[2][5]

Semantic evolution

Froissart (late 14th century) uses it hyperbolically for “very difficult”: lieu impossible pour assiéger.[2] Il est impossible que is found in Amyot (mid-16th century), and impossible! as an exclamation in 1798.[5][2] The noun l'impossible is in Marot (1553); Montaigne writes of la difference entre l'impossible et l'inusité.[2][7]

Later senses are “extravagant” (Beaumarchais, 1784), “unreal, fantastic” (Gautier, 1843), “with no way out” (situation impossible, 1862) and, of a person, “unbearable” (Renan, 1857).[2][8] Impossible n'est pas français is a proverb.[1]

Timeline

  • c. 1227 – Chose impossible, Besant de Dieu.[2]
  • Late 14th century – “Very difficult”, Froissart.[2]
  • 1553 – L'impossible, Marot.[2]
  • 1784 – “Extravagant”, Beaumarchais.[2]
  • 1798 – Impossible![2]
  • 1857 – Of a person, “unbearable”, Renan.[2][8]

Meanings

Adjective

  1. impossible: that cannot be, happen or be done: c'est impossible, impossible à dire, il est impossible que.[9][1]
  2. Very difficult; absurd, extravagant: un nom impossible, à des heures impossibles.[9][2]
  3. (of a person) unbearable: un enfant impossible.[1][2]

Noun

  1. L'impossible: the impossible: faire l'impossible, to do one's utmost.[1][7]

Word family

  • impossiblement
  • impossibilité

Usage notes

Impossible n'est pas français (“there is no such word as impossible”) and à cœur vaillant rien d'impossible are proverbs.[1]

References

  1. ^ a b c d e f g h Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n 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. ^ Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  5. ^ a b c Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse
  6. ^ Wartburg, Walther von, et al. (1922–2002), Französisches Etymologisches Wörterbuch, 25 vols., Bonn / Leipzig / Basel: Klopp / Teubner / Zbinden, p. 4, 600a
  7. ^ a b c Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette
  8. ^ a b Quemada, Bernard, ed. (1959–2006), Datations et documents lexicographiques (Base historique du vocabulaire français, BHVF), Paris: Klincksieck / CNRS / Champion; ATILF
  9. ^ a b Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert

Related etymologies

Cite this entry

“Impossible.” Etymologically, 18 Oct. 2026, etymologically.com/fr/impossible. Accessed 18 Oct. 2026.

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