What's the difference between mauvais and mal?

Mauvais is an adjective and describes nouns, agreeing with them: une mauvaise idée. Mal is an adverb and describes verbs, and it never changes: il a mal répondu. Mal is also a noun meaning pain, which is why j'ai mal works on its own.

How do you say something hurts in French?

Avoir mal à plus the body part with a definite article: j'ai mal à la tête, il a mal au dos, elle a mal aux pieds. To say you're hurting someone else, use faire mal: tu me fais mal.

Does pas mal mean bad?

The opposite. Pas mal means quite good or rather well: elle chante pas mal is a compliment. Pas mal de means quite a lot of: il y avait pas mal de monde, there were a fair few people there.

Is it je suis mal or je suis mauvais?

They say different things. Je suis mauvais means I'm bad at something or I'm a bad person; je suis mauvais en maths is the usual context. Je suis mal means I'm uncomfortable or not doing well: je suis mal installé.

What is the comparative of mauvais?

Pire, or plus mauvais, which are largely interchangeable: c'est pire que prévu. The adverb mal takes plus mal: il joue plus mal qu'avant. The older adverbial comparative pis survives mainly in tant pis, never mind.

French grammar · Intermediate

Mauvais vs. Mal: Bad and Badly in French

Written by Camille Laurent, Lead French Curriculum Editor · Reviewed May 2026

Mauvais is the adjective: it describes a noun and agrees with it. Mal is the adverb: it describes a verb and never changes. Mal is also a masculine noun meaning pain or evil, which is where avoir mal and faire mal come from.

C'est un mauvais film, et il est très mal joué.

It's a bad film, and it's very badly acted.

What it is

This pair is the negative mirror of bon and bien, with one extra complication: mal doubles as a noun. So mal can mean badly, and it can also mean the pain or the harm itself, which is why j'ai mal is a complete French sentence.

une mauvaise idée (a bad idea), il a mal compris (he misunderstood), j'ai mal au dos (my back hurts).

How to spot it

Find what's being described. A noun takes mauvais and agreement; a verb takes mal. If mal has an article or avoir in front of it, it's the noun.

une mauvaise nouvelle — bad news (noun → adjective)
Il conduit mal. — He drives badly. (verb → adverb)
J'ai mal à la gorge. — I have a sore throat. (noun, with avoir)
Ça sent mauvais. — That smells bad. (fixed adverbial use of mauvais)

Sentir is the trap in both directions: ça sent mauvais uses the adjective as an adverb, while je me sens mal uses the ordinary adverb.

Mauvais vs. Mal Quick Reference

Every use of the two words

Word	Role	Agrees?	Example
mauvais	adjective before a noun	mauvais, mauvaise, mauvais, mauvaises	un mauvais choix — a bad choice
mal	adverb after a verb	never	Elle a mal dormi. — She slept badly.
mal	noun	plural: les maux	avoir mal à la tête — to have a headache
être mal	adverb after être	never	Je suis mal assis. — I'm uncomfortable here.
être mauvais	adjective after être	agrees	Ce vin est mauvais. — This wine is bad.
pas mal	adverb	never	C'est pas mal. — That's not bad at all.
sentir mauvais	invariable	never	Ça sent mauvais. — That smells bad.
Comparative	pire / plus mal	pire agrees in number	C'est pire. / Il joue plus mal.

Common Mauvais vs. Mal Examples in French

Each word in the territory that belongs to it:

Mauvais: Describing a Noun

Il fait mauvais temps.: The weather is bad.
C'est une mauvaise excuse.: That's a poor excuse.
J'ai eu de mauvaises notes.: I got bad marks.
Ce lait est mauvais.: This milk has gone off.

Mauvais goes in front of the noun, like bon. That also means des reduces to de: de mauvaises habitudes.

Mal: Describing a Verb

Il écrit très mal.: He writes very badly.
Tu as mal calculé.: You worked it out wrong.
Ça s'est mal terminé.: It ended badly.
Je me suis mal exprimé.: I put that badly.

In compound tenses mal slots between the auxiliary and the participle: tu as mal compris.

Mal as a Noun: Pain and Harm

J'ai mal aux dents.: I have toothache.
Tu me fais mal.: You're hurting me.
Elle s'est fait mal au genou.: She hurt her knee.
Il a du mal à se concentrer.: He has trouble concentrating.

Avoir mal à is the standard way to say something hurts, and the body part takes a definite article.

Pas Mal: A Compliment

Ce n'est pas mal du tout.: That's really not bad.
Il y avait pas mal de monde.: There were quite a few people.
Elle se débrouille pas mal.: She manages pretty well.
J'ai pas mal travaillé.: I've worked a fair bit.

Pas mal is positive in French, meaning quite good or quite a lot. It's not a lukewarm response.

How to Choose Between Them

The adjective-adverb split does most of the work; the noun accounts for almost all the rest.

Mauvais Qualifies Nouns, Mal Qualifies Verbs

Exactly the same principle as bon and bien. If the thing being judged is a person or an object, use mauvais and agree it; if it's an action, use mal and leave it alone.

un mauvais joueur qui joue mal

a bad player who plays badly

Noun → mauvais. Verb → mal.

Mauvais Comes Before the Noun

Mauvais belongs to the group of adjectives that precede, alongside bon, grand, and petit. Placing it after gives an emphatic, almost literary flavour.

une mauvaise réputation

a bad reputation

mauvais + noun.

Mal Is Also a Noun

As a masculine noun, mal means pain, harm, or evil. Its plural is irregular: les maux. This use accounts for the whole avoir mal and faire mal family.

les maux de tête et les maux de dos

headaches and backaches

mal → maux.

Être Mal and Être Mauvais Mean Different Things

Être mauvais judges quality: this thing is bad, or this person is bad at something. Être mal describes a state: uncomfortable, awkwardly placed, or unwell.

Je suis mauvais en maths, et là je suis mal assis.

I'm bad at maths, and right now I'm sitting uncomfortably.

Quality → mauvais. State → mal.

Pas Mal Is a Positive

The negative of mal doesn't come out neutral. Pas mal means decidedly good, and pas mal de means quite a lot of, in the same way English not bad is a mild compliment.

Elle chante pas mal.

She's a pretty good singer.

pas mal = quite good.

Common Mistakes with Mauvais vs. Mal

Incorrect: C'est un mal film. — It's a bad film.

Correct: C'est un mauvais film. — It's a bad film.

Film is a noun, so it needs the adjective mauvais. Mal in front of a noun would be read as the noun meaning pain, which makes no sense here.

Incorrect: Il joue mauvais. — He plays badly.

Correct: Il joue mal. — He plays badly.

Jouer is a verb, so it takes the adverb. Mauvais only follows a verb in the fixed perception phrase ça sent mauvais.

Incorrect: J'ai mauvais à la tête. — I have a headache.

Correct: J'ai mal à la tête. — I have a headache.

This is the noun mal, not the adjective. Avoir mal à is a fixed construction and mauvais can't replace the noun in it.

Incorrect: Ça sent mal. — That smells bad.

Correct: Ça sent mauvais. — That smells bad.

Verbs of perception take the adjective as an invariable adverb: sentir bon, sentir mauvais. Ça sent mal would suggest the smelling itself is being done badly.

The Noun Mal and Its Family

Three constructions built on the noun account for most of the everyday uses of this word.

Avoir mal à for pain

Avoir mal à plus a definite article is how French locates pain. The preposition contracts as usual: à + le gives au, à + les gives aux.

J'ai mal à la tête.: I have a headache.
Il a mal au ventre.: He has stomach ache.
Elle a mal aux pieds.: Her feet hurt.
Tu as mal où ?: Where does it hurt?

Faire mal is the other half of the pair: tu me fais mal means you're hurting me, and se faire mal means to hurt oneself.

Avoir du mal à for difficulty

Avoir du mal à plus an infinitive means to find something hard. It's the everyday alternative to avoir des difficultés à and much more common in speech.

J'ai du mal à comprendre.: I'm struggling to understand.
Il a du mal à dormir.: He has trouble sleeping.
On a eu du mal à trouver.: We had a hard time finding it.

Note the partitive du: it's avoir du mal, never avoir le mal, which would mean something quite different.

Le mal, le bien, and set phrases

With a definite article, mal becomes an abstract noun opposed to le bien. Several fixed expressions use it in this sense.

le bien et le mal: good and evil
le mal du pays: homesickness
le mal de mer: seasickness
Ça ne fait pas de mal.: It can't hurt.

Le mal de mer and le mal du pays follow different article patterns, so they're best learned as blocks.

Mauvais vs. Mal FAQs

What's the difference between mauvais and mal?: Mauvais is an adjective and describes nouns, agreeing with them: une mauvaise idée. Mal is an adverb and describes verbs, and it never changes: il a mal répondu. Mal is also a noun meaning pain, which is why j'ai mal works on its own.
How do you say something hurts in French?: Avoir mal à plus the body part with a definite article: j'ai mal à la tête, il a mal au dos, elle a mal aux pieds. To say you're hurting someone else, use faire mal: tu me fais mal.
Does pas mal mean bad?: The opposite. Pas mal means quite good or rather well: elle chante pas mal is a compliment. Pas mal de means quite a lot of: il y avait pas mal de monde, there were a fair few people there.
Is it je suis mal or je suis mauvais?: They say different things. Je suis mauvais means I'm bad at something or I'm a bad person; je suis mauvais en maths is the usual context. Je suis mal means I'm uncomfortable or not doing well: je suis mal installé.
What is the comparative of mauvais?: Pire, or plus mauvais, which are largely interchangeable: c'est pire que prévu. The adverb mal takes plus mal: il joue plus mal qu'avant. The older adverbial comparative pis survives mainly in tant pis, never mind.