Plural Adjectives in French

Quick Answer

An adjective is a word that is used to describe a noun.

examples

une fille intelligente
an intelligent girl

des voitures noires
black cars

French adjectives agree in gender and in number with the nouns they describe. In des voitures noires (black cars), noires (black)—which is the feminine plural form of noir (black)—is used because voitures (cars) is feminine and plural. In this article, you'll learn how to form plural adjectives in French!

Questions This Article Answers

How do I use adjectives in French?

How do you form plural adjectives in French?

Do adjectives come before or after the noun in French?

Adjective Placement in French

In French, adjectives are typically used after the noun. Let's take a look at some examples in the table below.

Examples of French Adjective Placement

FrenchEnglish
la voiture noirethe black car
un aéroport videan empty airport
des films américainsAmerican movies

Exception: Prenominal Adjectives in French

Some French adjectives come before the noun, just like in English! They are called prenominal adjectives. For example: un petit garçon(a little boy).

Learn which adjectives come before the noun in French in this article:

Adjective Agreement in French

In French, adjectives must agree with the nouns they describe in gender and number. This means that if the noun an adjective describes is feminine, the adjective must be feminine as well. If that same noun is also plural, the adjective will be feminine AND plural!

For example, les étudiantes(the [female] students) is feminine and plural, so any adjective used to describe it must also be feminine and plural. You can see a few examples in the table below!

French Adjective Agreement

FrenchEnglish
les étudiantes anglaisesthe English students
les étudiantes intelligentesthe intelligent students
les étudiantes heureusesthe happy students

Rules for Plural Agreement in French

Just like with gender agreement, there’s also a rule for plural agreement that works for the vast majority of French adjectives. Meet your friend: "The Main Rule"!

Rule 1. The Main Rule: Add an -S

Most French adjectives simply take an -s in the plural. To make an adjective plural, add an -s to the masculine or feminine form. Check out how in the table below!

French Plural Adjectives That End in -S

FrenchEnglish
des garçons intelligentsintelligent boys
des filles intelligentesintelligent girls
examples
Mes chiens sont très gentils.
My dogs are very friendly.
Les fourmis sont fascinantes.
Ants are fascinating.
Ces montagnes sont très belles.
These mountains are very beautiful.

Rule 2. When -EAU Becomes -EAUX

If an adjective ends with -eau, add an -x (instead of an -s) to make it plural. Let's take a look at a few examples.

French Plural Adjectives That End in -EAUX

FrenchEnglish
le beau chienthe beautiful dog
les beaus chiens
the beautiful dogs
les beaux chiens
the beautiful dogs
le nouveau professeurthe new teacher
les nouveaus professeurs
the new teachers
les nouveaux professeurs
the new teachers
examples
Ma voisine a de beaux yeux bleus.
My neighbor has beautiful blue eyes.
Tous ces livres sont nouveaux.
All these books are new.

Rule 3. When -AL Becomes -AUX

Most adjectives that end with -al in the singular will change to -aux in the plural. Check the table below for a few examples!

French Plural Adjectives That End in -AUX

SingularPluralEnglish
génialgéniauxawesome
originaloriginauxoriginal
spécialspéciauxspecial
examples
Ces films sont vraiment géniaux.
These movies are really awesome.
Ce sont des documents originaux.
These are original documents.

Exceptions

There are a few exceptions to this rule. The most frequent ones are shown in the table below.

Irregular Plural -AL Adjectives in French

SingularPluralEnglish
banalbanalsordinary
bancalbancalswobbly
fatalfatalsfatal
natalnatalsnative
navalnavalsnaval

Rule 4. Don't Change Anything

If the adjective you want to pluralize ends with either an -s or an -x in the singular form, don't change anything at all! The singular form and the plural form are identical, as you can see below.

French Adjectives That End in -S or -X

SingularPluralEnglish
grosgrosbig, large
françaisfrançaisFrench
douxdouxsoft
heureuxheureuxhappy
examples
Mes chiens sont très gros.
My dogs are very big.
Ils sont heureux.
They are happy.

Two Important Notes about Plural Adjectives

1. Gender Must Be Applied Before Number

The plural rules above apply to the specific form of the adjective you're looking at. For example, Rule 4 applies to the masculine français but not to the feminine française since the feminine does not end with an -s. Rule 3 applies to the masculine génial but not to the feminine géniale since the feminine does not end with -al. In other words, gender always applies before number. Let's take a look at a few examples.

Examples of Gender and Number in French Adjectives

SingularPluralEnglish
un frère génialdes frères géniauxawesome brother/s
une sœur génialedes sœurs génialesawesome sister/s
un étudiant françaisdes étudiants françaisFrench (male) student/s
une étudiante françaisedes étudiantes françaisesFrench (female) student/s

2. Invariable Color Adjectives in French

If the name of the color comes from the thing that is known for this color, then the adjective is invariable. It never changes!

French Color Adjectives

PluralEnglish
des gants orangeorange gloves
des chaussettes marronbrown (literally: chestnut) socks
des yeux noisettehazel (literally: hazelnut) eyes
des draps saumonsalmon sheets