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Irregular Adjective Endings

French Grammar from RapideFrench.com

Most adjectives add an ‘e’ if they are will a feminine noun, except if they already end in an ‘e’. There are quite a few exceptions though (singular masculine, plural masculine, singular feminine, plural feminine shown):

  • ancien, anciens, ancienne, anciennes (old)
  • bas, bas, basse, basses (low)
  • beau, beaux, belle, belles (beautiful)
  • blanc, blancs, blanche, blanches (white)
  • bon, bons, bonne, bonnes (good) – also masculine is bel before an ‘h’ or vowel word
  • bref, brefs, brève, brève (brief)
  • cher, chers, chère, chères (expensive)
  • doux, doux, douce, douces (soft)
  • épais, épais, épaisse, épaisses (thick)
  • entier, entiers, entière, entières (entire)
  • faux, faux, fausse, fausses (false)
  • favori, favoris, favorite, favorites (favorite)
  • fou, fous, folle, folles (mad)
  • frais, frais, fraîche, fraîches (fresh)
  • gentil, gentils, gentille, gentilles (nice)
  • gros, gros, grosse, grosses (big)
  • jaloux, jaloux, jalouse, jalouses (jealous)
  • long, longs, longue, longues (long)
  • neuf, neufs, neuve, neuves (brand new)
  • nouveau, nouveaux, nouvelle, nouvelles (new) – also masculine is nouvel before an ‘h’ or vowel word
  • premier, premiers, première, premières (first)
  • public, publics, publique, publiques (public)
  • roux, roux, rousse, rousses (redhead)
  • sec, secs, sèche, sèches (dry)
  • secret, secrets, secrète, secrètes (secret)
  • vieux, vieux, vieille, vieilles (old) – also masculine is vieil before an ‘h’ or vowel word
  • vif, vifs, vive, vives (lively)

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

  • chic
  • cool
  • extra
  • marron
  • orange
  • super