French Adjectives: Agreement, Placement & 80 Must-Know Words

Why French Adjectives Trip Up English Speakers

In English, an adjective is a fixed object. Big is big whether you are describing a house, a car, or three hundred elephants, and it always sits in front of the noun. French adjectives do neither of those things. They change their ending to match the noun, and a small but very common group of them jumps in front of the noun instead of behind it.

That is really the whole difficulty, and it is smaller than it feels. There are two questions to answer for every adjective you use:

1. What shape does it take? (agreement)
2. Where does it go? (placement)

Answer those two reliably and your French stops sounding assembled word by word. This guide covers both, plus the irregular forms that genuinely matter and a list of 80 adjectives worth learning before anything else.

Rule 1: Agreement — Adjectives Match the Noun

A French adjective agrees in gender (masculine or feminine) and number (singular or plural) with the noun it describes. The default machinery is simple:

• Masculine singular: the base form — petit
• Feminine singular: add -e — petite
• Masculine plural: add -s — petits
• Feminine plural: add -es — petites

So: un petit livre, une petite maison, des petits livres, des petites maisons.

Two things save you effort here. First, if the adjective already ends in -e, the feminine form is identical: rouge stays rouge, facile stays facile, jeune stays jeune. Second, if it already ends in -s or -x, the masculine plural does not change: un gars français → des gars français; un homme heureux → des hommes heureux.

A quick note on pronunciation, because this is where agreement actually becomes audible. Adding -e often makes a silent final consonant sound: petit (puh-TEE) becomes petite (puh-TEET); grand (grahn) becomes grande (grahnd). Adding -s changes nothing you can hear. So feminine agreement is something you say; plural agreement is mostly something you write.

Irregular Feminine Endings Worth Memorising

Roughly a dozen ending patterns behave differently. These cover almost everything you will meet:

The doubled-consonant group (-el, -en, -on, and also -eil, -ien) is the one students under-learn. Bon → bonne, not bone. Italien → italienne. Gentil → gentille. Say them out loud — the doubling is audible, which is exactly why native speakers notice when it is missing.

Five Adjectives with a Third Form

Beau, nouveau, vieux, fou and mou have a special masculine form used before a vowel or silent h, because beau ami is unpronounceable in French rhythm:

• beau / bel / belle — un beau garçon, un bel homme, une belle femme
• nouveau / nouvel / nouvelle — un nouveau livre, un nouvel ami, une nouvelle voiture
• vieux / vieil / vieille — un vieux château, un vieil arbre, une vieille maison

Plurals: beaux, nouveaux, vieux, and the feminine belles, nouvelles, vieilles.

These three are among the most-used adjectives in the language, so the effort pays back immediately.

Rule 2: Placement — Before or After the Noun?

The default in French is after the noun: une voiture rouge, un film intéressant, une idée brillante, un professeur patient. If you learn nothing else about placement, defaulting to "after" will be right most of the time.

The exception is a short, closed list of very common adjectives that go before the noun. English-language classrooms often teach this with the acronym BAGS:

• Beauty — beau, joli
• Age — jeune, vieux, nouveau, ancien
• Goodness — bon, mauvais, meilleur, gentil
• Size — grand, petit, gros, long, haut

Plus a handful that do not fit the acronym but behave the same way: autre, même, tel, chaque, premier, dernier.

Examples: un bon repas, une jolie robe, mon premier voyage, une autre question, un grand problème.

One small spelling consequence: before a plural pre-noun adjective, des usually becomes de. Des livres but de bons livres; des amies but de vieilles amies. This is a register thing — you will hear des bons livres in casual speech — but the written standard is de.

When Position Changes the Meaning

A small group of adjectives means one thing before the noun and something genuinely different after it. This is not a subtlety you can safely ignore, because the pairs are common:

The pattern behind it: before the noun tends to be figurative or subjective, after the noun tends to be literal and factual. That is not a hard law, but it predicts the list well enough to be useful.

Rule 3: Adjectives with Être

When an adjective follows être rather than sitting next to a noun, it still agrees — with the subject.

• Elle est intelligente.
• Ils sont fatigués.
• Mes sœurs sont françaises.

Mixed-gender groups take the masculine plural. One man in a group of ninety-nine women makes the whole group ils sont contents. Grammatically settled, politically much debated, and worth knowing because it comes up constantly.

The 80 French Adjectives to Learn First

Grouped so they are drillable. Masculine form given; apply the rules above.

Size and shape (10): grand, petit, gros, mince, long, court, large, étroit, épais, rond

Age and time (8): jeune, vieux, nouveau, ancien, moderne, récent, premier, dernier

Quality and judgement (12): bon, mauvais, meilleur, excellent, parfait, génial, nul, important, intéressant, ennuyeux, utile, inutile

Appearance (10): beau, joli, laid, mignon, propre, sale, clair, sombre, brillant, simple

Personality (14): gentil, méchant, sympa, timide, drôle, sérieux, patient, généreux, égoïste, honnête, poli, calme, curieux, travailleur

Feelings and states (12): heureux, content, triste, fatigué, malade, inquiet, énervé, surpris, amoureux, prêt, occupé, libre

Difficulty and quantity (8): facile, difficile, dur, simple, plein, vide, cher, gratuit

Temperature and sensation (6): chaud, froid, doux, fort, léger, lourd

Want to drill these with pronunciation and gender built in? Download our free French flashcards at French Keys — the adjective set pairs each word with a short phrase, so you learn the agreement and the placement together rather than as separate rules.

How to Practise So It Sticks

Learning adjectives as isolated dictionary entries is what makes agreement feel like a test you keep failing. Three habits fix that.

Learn adjectives inside a noun phrase, never alone. Not "vieux = old" but "un vieil ami". The phrase carries the gender, the placement and the irregular form in one unit, and it comes back intact when you need it mid-sentence.

Describe things out loud, in threes. Pick an object in the room and give it three adjectives: une table longue, marron et assez vieille. Thirty seconds, no notebook. You are training the agreement reflex under mild time pressure, which is the condition you actually need it in.

Write five sentences a day with an adjective before the noun. The BAGS group is small enough to overlearn in a week, and getting it automatic removes the most common giveaway of an intermediate English speaker: putting every adjective after the noun because the default rule was the only one that stuck.

If you want a broader foundation first, our guide to French noun gender is the natural companion to this one — agreement is only as reliable as your sense of whether a noun is le or la.

Start Using Them Tomorrow

French adjectives come down to three decisions you can make in a fraction of a second once they are trained: match the gender, match the number, and default to after the noun unless it is one of the fifteen BAGS words. Everything else in this guide is detail layered on top of that spine.

The fastest way to make those decisions automatic is to be corrected while you are speaking, not three days later when you review your notes. Book a free assessment with Magali at French Keys — we will listen for where your agreement is already solid, where it slips under pressure, and build a plan around the gaps that are actually costing you fluency.