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Why French says 'des yeux bleu clair', not 'bleus clairs'

By now you know that French colour adjectives agree with their noun: des yeux bleus, une robe verte, des fleurs jaunes. There is one surprise, though. As soon as a colour is made more precise by a second word, such as clair, foncé, pâle or another colour, the whole expression stops agreeing. You say des yeux bleu clair and une robe vert foncé, with no extra -s and no extra -e anywhere.

English speakers who have worked hard on agreement often trip over this. They write bleus clairs or verte foncée because adding endings has become automatic. In English, 'light-blue eyes' never changes, so there is no instinct to stop you. In French, you need to learn when to switch the agreement off.

Word list
blancmA1 white des murs blancs; des murs blanc cassé bleumA1 blue des yeux bleus; des yeux bleu clair brunmA1 brown des cheveux bruns; des cheveux brun foncé clairmA1 light des couleurs claires; des murs gris clair foncémA1 dark des tons foncés; des vestes vert foncé grismA1 grey des chemises grises; des chemises gris clair jauneA1 yellow des fleurs jaunes; des fleurs jaune pâle noirmA1 black des cheveux noirs; des cheveux bleu-noir roseA1 pink des robes roses; des robes rose pâle rougeA1 red des roses rouges; des roses rouge sombre sombreA1 dark des pièces sombres; des robes bleu sombre vertmA1 green des feuilles vertes; des feuilles vert foncé blondmA2 blond des cheveux blonds; des cheveux blond clair pâleA2 light des joues pâles; des fleurs jaune pâle pourpreA2 purple des rideaux pourpres; des rideaux rouge pourpre violetmA2 purple des fleurs violettes; des fleurs violet foncé dorémB1 golden des reflets dorés; des cheveux blond doré
How it works

A colour on its own behaves like any adjective and agrees in gender and number. Once two words combine to name one precise shade, the pair is treated as a fixed label and stays invariable. Neither part takes an ending, whatever the noun.

Elle a les yeux bleus.
(She has blue eyes.)
Elle a les yeux bleu clair.
(She has light-blue eyes.)

Two kinds of combination trigger the rule:

Colour + shade word

bleu clair, vert foncé, jaune pâle, rouge sombre. These are written as two separate words.

Colour + colour

bleu-vert, gris-bleu, bleu-noir. These are joined with a hyphen and describe one mixed colour.

Rule of thumb: one colour word agrees, two words naming one shade do not.

The words
Shade words: clair, foncé, sombre, pâle

Clair, foncé, sombre and pâle agree normally when they stand alone (des pièces sombres, des joues pâles). Placed after a colour, they freeze together with it.

J'ai acheté deux chemises vert foncé.
(I bought two dark-green shirts.)
Ma grand-mère a les cheveux gris clair.
(My grandmother has light-grey hair.)
Il y a des fleurs jaune pâle dans le jardin.
(There are pale-yellow flowers in the garden.)
Il lui a offert des roses rouge sombre.
(He gave her dark-red roses.)
More colours in compounds

Brun, blanc, rose, violet and pourpre follow the same pattern. Even in the feminine, nothing is added.

Mon frère a les cheveux brun foncé.
(My brother has dark-brown hair.)
Les murs de la cuisine sont blanc cassé.
(The kitchen walls are off-white.)
Elle porte une robe rose pâle.
(She's wearing a pale-pink dress.)
J'ai trouvé des chaussettes violet foncé.
(I found some dark-purple socks.)
Les rideaux du salon sont rouge pourpre.
(The living-room curtains are crimson.)
Colour + colour

When two colours mix into one, join them with a hyphen. Noir often appears this way.

Les volets de la maison sont bleu-gris.
(The shutters on the house are blue-grey.)
Elle a les cheveux bleu-noir.
(She has blue-black hair.)
Watch out

The typical mistake is agreeing one or both halves: des chemises vertes foncées or une jupe verte claire. The correct forms are des chemises vert foncé and une jupe vert clair.

Compare these two phrases, which mean different things: des billes bleues et vertes means some marbles are blue and some are green, so each colour agrees. Des billes bleu-vert means every marble is the same blue-green shade, so nothing agrees.

The rule also covers colour + noun combinations such as bleu marine (navy blue), vert pomme (apple green) and rouge vif (bright red): des pulls bleu marine, des vestes rouge vif.

Summary

A single colour agrees with its noun: des yeux bleus, une robe verte. Two words that name one shade, whether a colour plus clair, foncé, pâle or sombre, or two colours joined by a hyphen, stay exactly as they are: des yeux bleu clair, une robe vert foncé, des volets bleu-gris. If the colour needs a second word, drop the endings.