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French Grammar from RapideFrench.com

Adjectives: Irregular Adjective Endings

Most adjectives use add an ‘e’ if they accompany a feminine noun, and an 's' if they accompany a plural noun.

Masculine (no change)Feminine (add 'e')Masculine Plural (add 's')Feminine Plural (add 'es')
un chat noirun voiture noiredes chats noirsdes voitures noires

The exceptions below are shown in this order: singular masculine, singular feminine, plural masculine, plural feminine shown.

However for some adjectives ending in a consonant, double the last consonant before adding the 'e':

  • ancien, anciens, ancienne, anciennes (old)
  • bas, basse, bas, basses (low)
  • bon, bonne, bons, bonnes (good)
  • épais, épaisse, épais, épaisses (thick)
  • gentil, gentille, gentils, gentilles (nice)
  • gros, grosse, gros, grosses (big)

For some adjectives ending in 'e'+consonant: 'ef' 'ève' for the feminine, 'er' 'ère' for the feminine, 'ec' 'èche' for the feminine, and 'et' 'ète' for the feminine:

  • bref, brève, brefs, brève (brief)
  • cher, chère, chers, chères (expensive)
  • entier, entière, entiers, entières (entire)
  • premier, première, premiers, premières (first)
  • sec, sèche, secs, sèches (dry)
  • secret, secrète, secrets, secrètes (secret)

There are quite a few other exceptions – you might notice some trends:

  • beau, belle, beaux, belles (beautiful) – also masculine is bel before an ‘h’ or vowel word
  • blanc, blanche, blancs, blanches (white)
  • doux, douce, doux, douces (soft)
  • faux, fausse, faux, fausses (false)
  • favori, favorite, favoris, favorites (favorite)
  • fou, folle, fous, folles (mad) – also masculine is fol before an ‘h’ or vowel word
  • frais, fraîche, frais, fraîches (fresh)
  • heureux, heureux, heureuse, heureuses (happy)
  • jaloux, jalouse, jaloux, jalouses (jealous)
  • long, longue, longs, longues (long)
  • neuf, neuve, neufs, neuves (brand new)
  • nouveau, nouvelle, nouveaux, nouvelles (new) – also masculine is nouvel before an ‘h’ or vowel word
  • public, publique, publics, publiques (public)
  • roux, rousse, roux, rousses (redhead)
  • tout, tous, toute, toutes (all)
  • vieux, vieille, vieux, vieilles (old) – also masculine is vieil before an ‘h’ or vowel word
  • vif, vive, vifs, vives (lively)

There are also some adjectives that don’t change for feminine or plural nouns (invariable adjectives):

  • chic
  • cool
  • extra
  • marron
  • orange
  • super
  • sympa (short for sympathetique)