The comparative adjective is used to compare a quality between two elements. It expresses superiority, equality, or inferiority, and it is formed with the adjective agreeing with the noun it qualifies, as in [Agreement of the adjective]. Its usage also depends on the position of the adjective, which most often follows the noun, as in [Position of the adjective].

Superiority is formed with more, then the adjective, then than. The adjective agrees with the noun being compared, and the construction also allows comparing a quality to a subordinate clause or a more complex group. When comparing quantities or abstract ideas, one uses more of before the noun.

IdéeIdea	ExempleExample
plus + adjectif + quemore + adjective + than	Il est plus grand que Paul.He is taller than Paul.
plus de + nom + quemore of + noun + than	Elle a plus de patience que toi.She has more patience than you.
plus + adjectif + que + subordonnéemore + adjective + than + subordinate clause	Ce document est plus fiable qu’on ne croit.This document is more reliable than one might think.

Equality is formed with as, then the adjective, then as. This structure says that two elements share the same quality to the same degree, with no idea of difference. It is used with adjectives of size, speed, wealth, precision, or any other measurable property.

IdéeIdea	ExempleExample
aussi + adjectif + queas + adjective + as	Elle est aussi rapide que toi.She is as fast as you.
même degrésame degree	Ce plan est aussi précis que le précédent.This plan is as precise as the previous one.
qualité partagéeshared quality	Son idée est aussi claire que la vôtre.Her idea is as clear as yours.

Inferiority is formed with less, then the adjective, then than. It indicates that an element possesses the quality at a lower degree than another. This structure remains regular and works with short adjectives as well as longer ones.

IdéeIdea	ExempleExample
moins + adjectif + queless + adjective + than	Ce livre est moins cher que l’autre.This book is cheaper than the other.
degré inférieurlower degree	Aujourd’hui, il fait moins froid qu’hier.Today, it is less cold than yesterday.
comparaison simplesimple comparison	Cette chaise est moins confortable que celle ci.This chair is less comfortable than this one.

In a comparison, the adjective agrees in gender and number with the noun it describes. The comparative does not change the agreement rule of the adjective, so a feminine or plural noun requires the feminine or plural form. To find the expected form, one must first know the base adjectival form, as in [Formation of the Adjective].

IdéeIdea	ExempleExample
masculin singuliermasculine singular	Un frère plus grand.A taller brother.
féminin singulierfeminine singular	Une sœur plus grande.A taller sister.
plurielplural	Des frères plus grands.Older brothers.

Most comparative adjectives follow the noun, because the qualifying adjective is usually placed after the noun in French. Some common adjectives appear before the noun, and this position remains visible even in comparison. Therefore, the comparative structure does not replace the general rules of [Position of the adjective].

IdéeIdea	ExempleExample
après le nomafter the noun	Un stylo plus fin.A finer pen.
avant le nombefore the noun	Une plus belle maison.A more beautiful house.
placement conservéplacement preserved	Un plus petit jardin.A smaller garden.

Better is an adverb and is used to compare a verb or the action itself. 'Better' as an adjective is 'meilleur' and is used to compare a noun or a quality expressed as an attribute. This distinction avoids confusion between the way someone acts and the value of something or someone.

IdéeIdea	ExempleExample
mieux pour le verbebetter for the verb	Il parle mieux.He speaks better.
meilleur pour le nombetter for the noun	Il est meilleur que lui.He is better than him.
fonction différentedifferent function	Elle chante mieux, mais sa chanson est meilleure.She sings better, but her song is better.

Some comparatives are irregular and must be learned as lexical forms. Good becomes better, bad can become worse or worse depending on register and emphasis, and little becomes lesser in more formal or precise usage. The form 'plus bon' is not correct in standard French, and one uses 'meilleur' instead.

IdéeIdea	ExempleExample
bon devient meilleurgood becomes better	Ce pain est meilleur que l’autre.This bread is better than the other.
mauvais devient pirebad becomes worse	Cette panne est pire que la précédente.This breakdown is worse than the previous one.
peu devient moindrelittle becomes lesser	Il y a une moindre chance de pluie.There is a lesser chance of rain.

In casual language, one sometimes hears 'plus mauvais' or even 'plus meilleur', but these forms do not belong to standard careful usage. 'Pire' is often stronger or more expressive than 'plus mauvais', while 'plus mauvais' emphasizes the direct comparison more. The choice thus depends on register and the desired effect.

RégionRegion	Mot ou expressionWord or expression	Définition régionaleRegional definition	ExempleExample
Registre standardStandard register	pireworse	Forme irrégulière privilégiée dans la langue soignée pour exprimer un degré plus défavorable.Irregular form preferred in careful language to express a more unfavorable degree.	La situation est pire qu’avant.The situation is worse than before.
Registre familierColloquial register	plus mauvaismore bad	Forme entendue dans la langue parlée pour renforcer une comparaison négative.A form heard in spoken language to reinforce a negative comparison.	Son idée est plus mauvais que la mienne.His idea is worse than mine.
Registre standardStandard register	plus bonplus good	Forme non correcte qu’il faut remplacer par meilleur.An incorrect form that must be replaced by meilleur.	Ce choix est meilleur que l’autre.This choice is better than the other.

The comparative can refer to a whole noun with more of, which expresses a greater quantity without an adjective. It can also be extended with 'than' followed by a subordinate clause, which allows a more flexible and nuanced comparison. These structures widen the comparison beyond the adjective alone and are often used in formal or precise style.

IdéeIdea	ExempleExample
plus de + nommore of + noun	plus de patience que toimore patience than you.
que + subordonnéethat + subordinate clause	plus fiable qu’on ne croitmore reliable than one might think.
comparaison étendueextended comparison	plus simple qu’il ne semblesimpler than it seems.

French comparatives oppose a quality to another element through superiority, equality, or inferiority. They respect the agreement of the adjective, generally follow the rules for adjective position, and often require distinguishing the adjective from the verb being compared by better and best. Irregular forms such as meilleur, pire, and moindre are essential, as is the use of more of for nouns and que before a subordinate clause.