Adjectives ending in -s or -x change in the plural forms only when feminine

Look at these masculine cases:

un homme heureux et des hommes heureuxa happy man and happy men

un vent frais et des vents fraisa cool wind and cool winds

le gros chat et les gros chatsthe big cat and the big cats

Adjectives ending in-s and -x stay the same in masculine plural forms.

BUT

Look at these feminine cases:

une femme heureuse et des femmes heureusesa happy woman and happy women

une brise fraîche et des brises fraîchesa fresh breeze and fresh breezes

la grosse souris mais les grosses souristhe big mouse but the big mice

Note that the feminine plural forms of these adjectives are regular (add -s on the feminine singular form)

 

Common adjectives ending in -s and -x

 

Masculine

Feminine

 

singular

plural

singular

plural

delicious

délicieux

délicieux

délicieuse

délicieuses

happy

heureux

heureux

heureuse

heureuses

wrong/false

faux

faux

fausse

fausses

large/fat

gros

gros

grosse

grosses


See also previous related lesson: Make most adjectives plural by adding -s

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Learn more about these related French grammar topics

Examples and resources

"Plurals in French" by www.frenchspanishonline.com

feminine


la grosse souris mais les grosses souristhe big mouse but the big mice
une femme heureuse et des femmes heureusesa happy woman and happy women
une brise fraîche et des brises fraîchesa fresh breeze and fresh breezes

masculine


un vent frais et des vents fraisa cool wind and cool winds
le gros chat et les gros chatsthe big cat and the big cats
un homme heureux et des hommes heureuxa happy man and happy men
Clever stuff underway!