Etymologically

Etymology and origin of the French word mou

Confidence
Established
Formation
Inherited
First attested
c. 1150 Roman de Thèbes More words from the 12th century
Inherited from
Latin mollis via Old French
Ultimate origin
Latin mollis
Etymology tree
inherited borrowed derived
Latin mollis
French mou
Romanian moale
From the same root
Latin ēmolliō ← mollis
Latin molliculus ← mollis
Latin mollificō ← mollis
Latin molliō ← mollis
Latin molliter ← mollis
Latin mollitia ← mollis
Romanian moleață ← mollis
Romanian molicel ← mollis

Pronunciation

Forms

mou (masculine singular before vowel mol, feminine molle, masculine plural mous, feminine plural molles)[1] Old French mol, feminine mole.[2][3] Mou gradually replaced mol, which was the usual form until the 17th century;[3][4] mol survives before a vowel or mute h.[3][4]

Etymology

It is inherited from Old French mol, inherited from Latin mollis (“soft, supple, tender”).[2][5][6][1] The modern form arose beside the older one as fou did beside fol.[3] Rey and the Petit Robert connect the Latin word with an Indo-European base also seen in Ancient Greek μαλακός (malakós, “soft”) and in the English words mild and melt.[3][7]

The noun meaning “lungs (of a slaughtered animal)” is the adjective used as a noun, at first in the form mol in the 14th century.[4][7][3]

Cognate with Romanian moale, Italian molle, Occitan mol, Catalan moll, Spanish muelle and Portuguese mole.[7][8]

Earliest recorded meaning

It is first recorded about 1150 in the Roman de Thèbes, in terre mole “soft earth”, meaning “not hard to the touch”.[2][3] The Grand Robert dates the word to about 1130.[4]

Semantic evolution

From “not hard” came “soft, comfortable” (about 1170) and, of flesh, “tender, fragile” (about 1200).[2][3] It was also used of words spoken gently (1174–1176), a use that disappeared in Middle French; when it is said of speech again from the 17th century, it is pejorative, “languid and affected” (1690).[3][2]

A pejorative strain appears already in Old French: of character, mol meant “weak, cowardly” (about 1200), as later in mou comme une chiffe; of things, “too supple, lacking firmness” (about 1225), and of a fruit “beginning to go bad”.[3][2] Mols plaisirs (1587) are pleasures that make one soft.[2] Said of a work of art it is always disparaging, as in touche molle (1762).[3]

As a noun it first named the calf of the leg (mol de la jambe, 1324), the source of mollet, then the lungs of a slaughtered animal (1393), and in slang the human lung (1902).[3][2] Sailors say donner du mou for slackening a rope (1821).[2] In familiar phrases mou stands for a soft part of the body: bourrer le mou à quelqu'un “to fill someone's head with lies” (whence Céline's c'est du mou, 1936) and rentrer dans le mou, where it refers mainly to the belly (1928).[3][7]

Timeline

  • c. 1150 – Terre mole in the Roman de Thèbes.[2][3]
  • c. 1170 – Chrétien de Troyes uses it for “soft, comfortable” in Erec et Enide.[2][3]
  • 1174–1176 – It is used of words said gently.[2][3]
  • c. 1200 – Of character, “weak, cowardly”.[2][3]
  • 1324 – Mol de la jambe “calf of the leg”.[2][3]
  • 1393 – The Ménagier de Paris uses it for the lungs of a slaughtered animal.[2][3]
  • 1587 – Mols plaisirs “pleasures that make one soft”.[2]
  • 1690 – Furetière records it of affected, languid language.[2][3]
  • 1821 – Nautical donner du mou “to slacken a rope”.[2]
  • 1902 – Slang use for the human lung.[3]
  • 1928 – Rentrer dans le mou is recorded.[3]

Meanings

Adjective

  1. Soft: yielding to the touch or to pressure, the opposite of dur.[2][9][1]
  2. Soft and comfortable, of a cushion or bed.[1][3]
  3. Lacking firmness, limp, slack.[2][3]
  4. (figurative) Of a person: lacking energy or character, feeble, spineless.[2][1][3]
  5. (art) Of a style or touch: lacking vigour.[3][2]
  6. Of the wind: gentle, weak.[2][10]
  7. (anatomy) Parties molles: the soft tissues of the body, as opposed to the skeleton.[2][9]

Noun

  1. Something soft.[9][1]
  2. The lungs or lights of a slaughtered animal, sold as offal, as in mou de veau.[7][3][1]
  3. (nautical) The slack of a rope: donner du mou.[2][1]
  4. (familiar) Bourrer le mou à quelqu'un: to fill someone's head with lies.[7][3]
  5. (familiar) Rentrer dans le mou à quelqu'un: to beat someone up.[7][3]

Adverb

  1. (familiar) Gently, without vigour.[11]

Word family

  • mollasse
  • mollesse
  • mollir
  • molard
  • amollir
  • mollet
  • ramollir
  • mollasson

References

  1. ^ a b c d e f g h i Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n o p q r s t u v w x y 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. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z 27 28 29 Rey, Alain, ed. (1992), Dictionnaire historique de la langue française, Paris: Le Robert
  4. ^ a b c d Rey, Alain, ed. (2005), Le Grand Robert de la langue française, electronic version, Paris: Le Robert
  5. ^ Wartburg, Walther von, et al. (1922–2002), Französisches Etymologisches Wörterbuch, 25 vols., Bonn / Leipzig / Basel: Klopp / Teubner / Zbinden, p. 6/3, 49b
  6. ^ Bloch, Oscar; Wartburg, Walther von (1989), Dictionnaire étymologique de la langue française, 8th ed., Paris: Presses universitaires de France
  7. ^ a b c d e f g Rey-Debove, Josette; Rey, Alain, eds. (2007), Le Petit Robert de la langue française, Paris: Le Robert
  8. ^ Meyer-Lübke, Wilhelm (1935), Romanisches etymologisches Wörterbuch, 3rd ed., Heidelberg: Winter
  9. ^ a b c Littré, Émile (1873–1877), Dictionnaire de la langue française, 4 vols. and supplement, Paris: Hachette
  10. ^ Guilbert, Louis; Lagane, René; Niobey, Georges, eds. (1971–1978; 1989), Grand Larousse de la langue française, Paris: Larousse
  11. ^ Dictionnaire de français Larousse, larousse.fr/dictionnaires/francais (accessed 2024)

Related etymologies

Cite this entry

“Mou.” Etymologically, 11 Nov. 2026, etymologically.com/fr/mou. Accessed 12 Nov. 2026.

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