At the A1 level, 'démentir' is a very difficult word that you probably won't use. Instead, you will use simple words like 'non' or 'dire que ce n'est pas vrai'. If you see 'démentir' in a text, just think of it as a formal way of saying 'to say it is not true'. For example, if someone says 'You are 20 years old' and you are actually 30, you can say 'No, that's wrong'. In a newspaper, they would use 'démentir'. It's important to know that it's a verb about truth and lies. You might see it in very simple news headlines, but don't worry about using it in your own speaking yet. Focus on 'dire que c'est faux' for now. The word is part of the 'mentir' (to lie) family, so that might help you remember it has something to do with the truth. At this level, just recognize that it is a 'serious' way to say no to a rumor.
At the A2 level, you can start to recognize 'démentir' in news snippets or simple articles. You know the verb 'mentir' (to lie), so you can see that 'démentir' is related. It is used when a person in authority, like a teacher or a local official, says that a rumor is false. You might use it in a simple sentence like 'Le directeur dément la rumeur.' (The director denies the rumor). It is a bit more formal than 'nier'. You should also notice that it is followed directly by a noun. You don't need 'que' or other complex structures most of the time. Remember the conjugation: 'je démens', 'tu démens', 'il dément'. It's like 'partir'. If you use it, you will sound very polite and educated. It's a good word to know for the reading part of your exams when they talk about news or public figures.
At the B1 level, you should be able to use 'démentir' in specific contexts, especially when talking about the news or social media. You understand that it's different from 'mentir' because it's about correcting a mistake or a lie, not telling one. You can use it to talk about celebrities or politicians: 'La star dément les rumeurs de mariage.' You should also be familiar with the noun 'un démenti'. If you hear 'Il a publié un démenti', you know he released an official statement saying something is false. You can also start using it in the passive voice: 'Cette nouvelle a été démentie.' This level is about moving away from basic verbs like 'dire' and using more precise verbs like 'démentir' to express formal actions. It shows you understand the difference between a casual conversation and an official statement.
At the B2 level, 'démentir' should be a regular part of your vocabulary, especially for writing and formal speaking. You understand its nuance: it's a formal refutation of information. You can use it in a variety of tenses, including the conditionnel and subjonctif. You also start using it in the sense of 'facts contradicting a theory' (e.g., 'Les résultats démentent ses prévisions'). You should be able to pair it with appropriate adverbs like 'formellement' or 'catégoriquement'. At this level, you distinguish 'démentir' from 'nier' (personal denial) and 'réfuter' (logical proof). You also understand the fixed expression 'ne pas se démentir', used to describe something that remains consistently successful or true. Your ability to use this word correctly in an essay about the media or politics is a clear indicator of your B2 proficiency.
At the C1 level, you use 'démentir' with precision and stylistic flair. You understand its rhetorical power in debates and academic writing. You can use it to analyze how information is controlled in society. You might use more complex structures like 'apporter un démenti cinglant' (to issue a stinging denial). You are comfortable with the pronominal form 'se démentir' in more abstract contexts, such as 'Sa générosité ne s'est jamais démentie' (His generosity never wavered). You also recognize when 'démentir' is used ironically or in literature to show a contrast between appearance and reality. You can discuss the legal implications of a 'démenti' and how it differs from 'diffamation'. Your vocabulary is rich enough to choose between 'démentir', 'infirmer', and 'désavouer' based on the exact social and legal context of the situation.
At the C2 level, 'démentir' is a tool you use to navigate the highest levels of French discourse. You understand its historical weight and its use in classical literature as well as modern diplomacy. You can use it in highly nuanced ways, such as discussing how a person's actions 'démentent' their stated values, exploring the philosophical gap between 'le dire' and 'le faire'. You are sensitive to the rhythm of the sentence when using the verb, and you can use the noun 'démenti' in sophisticated metaphors. You might analyze how a 'démenti' can sometimes inadvertently confirm a rumor in the eyes of the public (the Streisand effect). Your mastery is such that you can use the word in any register, from a formal diplomatic communiqué to a sharp intellectual critique, always with perfect grammatical and contextual accuracy.

démentir in 30 Seconds

  • Démentir means to formally deny the truth of a statement, rumor, or report, often in news or politics.
  • It is a transitive verb that follows the conjugation pattern of 'mentir' (je démens, nous démentons).
  • It can also mean that facts or events contradict a theory or a previously held expectation.
  • The noun form 'un démenti' refers to the official statement of denial itself.

The French verb démentir is a sophisticated and essential term in the French lexicon, primarily used when someone officially or formally denies the truth of a statement, a rumor, or an accusation. While the English verb 'to deny' is a frequent translation, démentir carries a weight of formal refutation that often appears in journalism, politics, and legal contexts. It implies that a specific claim has been made, and an authoritative source is now stepping forward to declare that claim false. For a B2 learner, understanding the nuance of démentir involves recognizing its transitive nature; you 'démentir' a thing (a rumor, a report, a statement) rather than a person directly in the same grammatical structure as 'nier'.

Formal Context
In the world of French media, you will constantly see headlines like 'L'Élysée dément les rumeurs de démission.' This usage signifies a formal communication intended to set the record straight.

Le ministre a dû démentir formellement les accusations de corruption portées contre lui par la presse locale ce matin.

Beyond the realm of speech and rumors, démentir is also used in a more abstract sense where events or facts 'démentir' a theory or an expectation. For instance, if a weather forecast predicts sunshine but it rains all day, the weather 'dément' the forecast. This 'contradiction by facts' is a common rhetorical device in French literature and academic writing. It suggests an objective reality that proves an earlier assumption wrong. This dual usage—both as a verbal act of denial and as a factual contradiction—makes démentir a versatile tool for expressing the gap between what is said and what is true.

Etymological Connection
The word shares a root with 'mentir' (to lie). The prefix 'dé-' acts as a reversal, literally meaning 'to un-lie' or to expose a lie/falsehood, although it has evolved to mean the formal act of denial.

Les faits ont fini par démentir toutes ses promesses électorales, provoquant une grande déception chez ses partisans.

In everyday conversation, while 'nier' or 'dire que c'est faux' are more common, using démentir adds a layer of precision and seriousness. It suggests that the speaker is not just disagreeing, but is providing a definitive counter-statement. This is why it is the verb of choice for public relations departments and official spokespeople. When you hear 'un démenti officiel,' you know that the situation has reached a level of importance where a casual 'no' is no longer sufficient. It is about the restoration of truth or the defense of one's reputation against specific, articulated claims.

Using démentir correctly requires an understanding of its grammatical structures and its typical objects. As a transitive verb, it almost always takes a direct object that represents a piece of information, a statement, or a rumor. Unlike English where you might 'deny an accusation,' in French you 'démentir une accusation' or 'démentir une nouvelle.' It is rarely used to deny an action you did yourself (for that, you would use 'nier avoir fait quelque chose'). Instead, démentir is about the external validity of information.

Common Direct Objects
Typical objects include: une rumeur (a rumor), une information (a piece of news), une allégation (an allegation), un rapport (a report), or des propos (words/remarks).

L'entreprise a rapidement publié un communiqué pour démentir les bruits de rachat qui circulaient sur les marchés financiers.

Another powerful way to use démentir is in the passive voice, which focuses on the information being proven false. For example, 'Cette information a été démentie par la police.' This structure is very common in news reports. Furthermore, the verb is frequently paired with adverbs that qualify the strength of the denial, such as 'formellement' (formally), 'catégoriquement' (categorically), or 'vigoureusement' (vigorously). These combinations emphasize the certainty and official nature of the refutation.

The Negative Construction
'Ne pas démentir' can sometimes mean 'to confirm' or 'to not contradict.' For example, 'Son succès ne se dément pas' means his success is continuing unabated (it isn't being contradicted by reality).

Malgré les critiques initiales, le succès de cette nouvelle application ne se dément pas après six mois d'utilisation.

In literary or highly formal contexts, you might see démentir used with a person as the object, but this is less common today. Usually, you dément someone's words, not the person themselves. For example, 'Il a démenti son adversaire' would imply he proved his opponent's statements to be false. Mastering these patterns allows a B2 student to transition from basic communication to nuanced, professional-level French, especially when discussing current events or scientific findings.

If you turn on a French news channel like BFMTV or France 24, or if you read newspapers like Le Monde or Le Figaro, you will encounter démentir almost daily. It is the bread and butter of political reporting and corporate communication. In the fast-paced world of social media, where rumors spread rapidly, the 'démenti' (the noun form, meaning 'denial') is the primary tool for damage control. You will hear it in press conferences where a spokesperson steps up to a microphone to clarify a misunderstanding or refute a scandal.

The 'Démenti' in Media
Headlines often use the infinitive or the past participle: 'Rumeurs de divorce : le couple dément.' or 'Information démentie par le Quai d'Orsay.'

Le porte-parole du gouvernement a pris la parole pour démentir tout projet de hausse des impôts avant la fin de l'année.

In the scientific and academic world, démentir is used when new evidence comes to light that invalidates a previous hypothesis. A researcher might say, 'Ces nouveaux résultats viennent démentir notre théorie initiale.' This usage is objective and carries no emotional weight; it is simply about the correction of data. Similarly, in the business world, a company might démentir rumors of a merger or a bankruptcy to stabilize its stock price. Hearing this word in a professional setting signals that a definitive stance is being taken against a particular narrative.

Sports Journalism
In football (soccer), when a player is rumored to be transferring to another club, the club or the agent will often 'démentir tout contact' with the other team.

L'entraîneur a tenu à démentir les tensions supposées dans les vestiaires après la défaite de samedi dernier.

Finally, you might hear it in historical documentaries. Historians use it to describe how later discoveries 'démentent' long-held myths or misconceptions about a person or an era. Because démentir implies a contrast between a claim and the truth, it is a perfect verb for storytelling that involves mystery, investigation, or the uncovering of secrets. Whether in a courtroom drama or a documentary about the cosmos, démentir is the word that marks the moment a falsehood is officially corrected.

The most frequent mistake English speakers make with démentir is confusing it with other verbs of denial, particularly 'nier' and 'contredire'. While they overlap, they are not always interchangeable. 'Nier' is generally used for personal denial of an action (e.g., 'Il nie avoir volé l'argent'), whereas démentir is used for refuting a statement or information (e.g., 'Il dément l'information selon laquelle il aurait volé l'argent'). Using démentir where 'nier' is required can make your French sound overly formal or slightly 'off'.

Confusion with 'Mentir'
Because 'démentir' contains the word 'mentir' (to lie), some learners mistakenly think it means 'to lie about something'. It actually means the opposite: to state that something is a lie or is false.

Attention : Ne confondez pas démentir (dire que c'est faux) avec mentir (dire quelque chose de faux).

Another common error is the conjugation. Démentir is a third-group verb that follows the pattern of 'mentir' and 'partir'. Many learners try to conjugate it like 'finir' (a second-group verb), resulting in incorrect forms like 'nous démentissons' instead of the correct 'nous démentons'. Remembering that it is built on the root of 'mentir' helps: if you can conjugate 'mentir', you can conjugate démentir. Also, avoid using 'démentir' with a person as a direct object unless you specifically mean you are proving their statements false; it is safer and more common to démentir the words themselves.

Misunderstanding 'Se Démentir'
Learners often struggle with the pronominal form 'ne pas se démentir'. It doesn't mean 'to not lie to oneself,' but rather 'to remain consistent' or 'to not fail'.

L'engouement pour le bio ne se dément pas, même avec l'inflation croissante.

Finally, be careful not to confuse démentir with the adjective 'dément' (insane/crazy). Although they share a Latin root related to the mind (mens), their meanings in modern French have diverged completely. A 'démenti' is a denial, but 'un dément' is an insane person. Using the verb in a context where you mean 'to drive someone crazy' would be a significant lexical error. Stick to using démentir for facts, rumors, and statements to stay on safe linguistic ground.

To truly master démentir, you must see how it sits alongside its synonyms. The most common alternative is nier. While démentir is about proving or stating that a specific piece of news is false, nier is the broader, more personal act of saying 'I didn't do it' or 'that isn't true.' Nier is often followed by a clause ('nier que...'), whereas démentir usually takes a direct noun object. If you are in a casual setting, you might just say 'contredire' (to contradict) or 'dire le contraire'.

Démentir vs. Réfuter
'Réfuter' is more intellectual. It means to prove an argument or a theory wrong using logic or evidence. 'Démentir' is more about the truth-value of a statement or rumor.

Le scientifique a pu réfuter l'hypothèse par des calculs, tandis que le porte-parole a dû démentir la rumeur de fraude.

Another interesting synonym is infirmer. This is a very formal, often legal or scientific term meaning to invalidate something. For example, 'De nouveaux indices sont venus infirmer son témoignage.' While démentir is the act of speaking out against a claim, infirmer is the result of that claim being proven false by something else. On the opposite side, the antonyms of démentir are confirmer (to confirm), corroborer (to corroborate), and attester (to attest/witness). Using these words in contrast helps clarify your meaning.

Démentir vs. Désavouer
'Désavouer' means to disavow or disown. If a minister makes a mistake, the President might 'désavouer' him, meaning they no longer support his actions or words.

Il ne s'est pas contenté de démentir les faits ; il a carrément désavoué son propre collaborateur en public.

In summary, choose démentir when you want to sound authoritative and formal about correcting a specific piece of false information. Use nier for personal denials, réfuter for logical arguments, and infirmer for legal or scientific invalidation. Understanding these distinctions is a hallmark of a B2/C1 level speaker who can navigate the nuances of French expression with precision and confidence.

Fun Fact

Although it comes from the same root as 'mentir' (to lie), 'démentir' is almost exclusively used for formal truth-seeking today, while 'mentir' remains a common everyday word.

Pronunciation Guide

UK /de.mɑ̃.tiʁ/
US /de.mɑ̃.tiʁ/
Stress falls on the final syllable: dé-men-TIR.
Rhymes With
mentir partir sortir sentir repentir consentir pressentir assentir
Common Errors
  • Pronouncing the final 'r' like an English 'r'.
  • Making the 'en' sound like 'en' in 'pen' instead of a nasal 'an'.
  • Confusing the pronunciation with 'dément' (the adjective).
  • Incorrectly adding a 's' sound in the middle like 'démens-tir'.
  • Stress on the first syllable.

Examples by Level

1

Il dément l'histoire.

He denies the story.

Simple present tense.

2

Elle veut démentir la rumeur.

She wants to deny the rumor.

Infinitive after 'veut'.

3

Le journal dément l'info.

The newspaper denies the info.

Direct object 'l'info'.

4

Je démens ce que tu dis.

I deny what you are saying.

First person singular 'démens'.

5

Ils démentent tout.

They deny everything.

Third person plural 'démentent'.

6

Tu démens la nouvelle ?

Are you denying the news?

Simple question.

7

Nous démentons le message.

We deny the message.

First person plural 'démentons'.

8

C'est faux, je démens.

It's false, I deny [it].

Intransitive usage here.

1

Le maire dément les accusations.

The mayor denies the accusations.

Formal context.

2

Il a démenti être là.

He denied being there.

Passé composé.

3

Elle va démentir ce bruit.

She is going to deny this noise (rumor).

Futur proche.

4

Le démenti est arrivé hier.

The denial arrived yesterday.

Noun form 'démenti'.

5

Vous démentez cette erreur ?

Are you denying this error?

Formal 'vous'.

6

On dément l'accident.

They (people) deny the accident.

Pronoun 'on'.

7

Elle n'a pas démenti la rumeur.

She did not deny the rumor.

Negative passé composé.

8

Pourquoi démentir la vérité ?

Why deny the truth?

Infinitive in a question.

1

L'acteur a démenti son divorce sur Instagram.

The actor denied his divorce on Instagram.

Modern context.

2

Le gouvernement doit démentir ces chiffres.

The government must deny these figures.

Modal verb 'doit'.

3

Elle a publié un démenti formel.

She published a formal denial.

Noun + adjective.

4

Les faits démentent sa version.

The facts contradict his version.

Abstract subject 'les faits'.

5

Il démentait toujours ses erreurs.

He was always denying his mistakes.

Imparfait.

6

Nous démentirons ces propos demain.

We will deny these remarks tomorrow.

Futur simple.

7

L'information a été vite démentie.

The information was quickly denied.

Passive voice.

8

Il ne faut pas démentir sans preuves.

One must not deny without proof.

Impersonal 'il faut'.

1

Il a tenu à démentir formellement les allégations.

He insisted on formally denying the allegations.

Expression 'tenir à'.

2

Son succès ne se dément pas malgré la crise.

His success does not falter despite the crisis.

Pronominal 'se démentir'.

3

La police a apporté un démenti catégorique.

The police issued a categorical denial.

Collocation 'apporter un démenti'.

4

Rien ne permet de démentir cette hypothèse.

Nothing allows for this hypothesis to be denied.

Complex structure.

5

Elle dément avoir eu connaissance du projet.

She denies having had knowledge of the project.

Démentir + infinitive.

6

Les chiffres démentent les promesses du ministre.

The figures contradict the minister's promises.

Abstract contradiction.

7

Bien qu'il démente, personne ne le croit.

Although he denies [it], nobody believes him.

Subjunctive after 'bien que'.

8

Le communiqué dément toute implication de la banque.

The press release denies any involvement of the bank.

Formal noun 'communiqué'.

1

Ses actes viennent démentir ses beaux discours.

His actions contradict his fine speeches.

Metaphorical usage.

2

L'intéressé s'est empressé de démentir la rumeur.

The person concerned hastened to deny the rumor.

Pronominal verb 's'empresser'.

3

Un démenti cinglant a été opposé à ces critiques.

A stinging denial was issued against these criticisms.

High-level vocabulary 'cinglant'.

4

L'histoire finit souvent par démentir les tyrans.

History often ends up proving tyrants wrong.

Philosophical usage.

5

Il a démenti ses propres propos lors de l'interview.

He contradicted his own remarks during the interview.

Refuting oneself.

6

La réalité dément parfois les prévisions les plus sûres.

Reality sometimes contradicts the most certain forecasts.

Abstract subject 'la réalité'.

7

Il est impératif de démentir ces fausses informations.

It is imperative to deny this false information.

Formal imperative structure.

8

Le démenti n'a pas suffi à calmer les esprits.

The denial was not enough to calm people down.

Metonymy 'calmer les esprits'.

1

Son flegme habituel ne s'est pas démenti une seule seconde.

His usual composure did not waver for a single second.

Refined pronominal usage.

2

L'œuvre de l'artiste dément toute classification simpliste.

The artist's work defies any simplistic classification.

Academic/Artistic context.

3

Il s'agit là d'un démenti flagrant à ses théories passées.

This is a blatant contradiction of his past theories.

High-level adjective 'flagrant'.

4

La postérité se chargera de démentir ces calomnies.

Posterity will take care of refuting these slanders.

Literary future.

5

Elle a opposé une fin de non-recevoir à ce démenti.

She gave a flat refusal to this denial.

Idiomatic legal expression.

6

Le démenti, bien que tardif, a rétabli une certaine vérité.

The denial, although late, restored a certain truth.

Nuanced concession clause.

7

Il a cru bon de démentir, au risque de paraître coupable.

He thought it wise to deny, at the risk of appearing guilty.

Complex psychological context.

8

Rien dans son attitude ne venait démentir son innocence.

Nothing in his attitude contradicted his innocence.

Literary negation.

Common Collocations

démentir formellement
démentir catégoriquement
démentir une rumeur
démentir une information
se démentir
apporter un démenti
être démenti par les faits
démentir vigoureusement
démentir un rapport
un démenti cinglant

Common Phrases

Sans se démentir

— Without failing or changing; consistently.

Il a poursuivi son effort sans se démentir.

Démentir les pronostics

— To prove the predictions or odds wrong.

L'outsider a démenti tous les pronostics en gagnant.

Un démenti officiel

— A formal statement saying something is false.

Nous attendons un démenti officiel de l'ambassade.

Démentir par l'exemple

— To prove something false by one's own actions.

Il dément les accusations de paresse par son travail acharné.

Se démentir soi-même

— To contradict oneself.

Il s'est démenti lui-même en changeant de version.

Faire l'objet d'un démenti

— To be officially denied.

Cette rumeur a fait l'objet d'un démenti immédiat.

Démentir point par point

— To refute every single detail of a statement.

L'avocat a démenti le témoignage point par point.

Démentir la rumeur publique

— To deny what everyone is saying.

Il est difficile de démentir la rumeur publique.

Ne pas se démentir

— To stay true to oneself or remain successful.

Sa passion ne se dément pas avec l'âge.

Opposer un démenti

— To issue a denial against something.

Le ministre a opposé un démenti aux journalistes.

Idioms & Expressions

"Laver son honneur par un démenti"

— To clear one's name by issuing a formal denial.

Il a lavé son honneur par un démenti public.

formal
"Démentir les attentes"

— To result in something different from what was expected.

Le film a démenti les attentes du public.

neutral
"Un démenti à la logique"

— Something that seems to go against common sense.

Sa décision est un démenti à toute logique.

literary
"Se démentir dans ses actes"

— When one's actions don't match one's words.

Il se dément dans ses actes quotidiens.

neutral
"Démentir le sort"

— To overcome a seemingly inevitable bad fate.

Elle a démenti le sort en guérissant.

literary
"Un démenti cinglant"

— A very sharp and direct denial.

Il a essuyé un démenti cinglant.

formal
"Démentir la chronique"

— To do something that surprises the gossip columns.

Leur mariage a démenti la chronique.

journalistic
"Démentir les apparences"

— To prove that things are not as they seem.

Sa force dément les apparences de fragilité.

literary
"Apporter un démenti formel"

— To officially state that something is false.

Le porte-parole a apporté un démenti formel.

formal
"Démentir un soupçon"

— To prove a suspicion wrong.

Son alibi a démenti tout soupçon.

neutral

Word Family

Nouns

démenti (m) - a denial

Verbs

mentir - to lie
se démentir - to contradict oneself / to fail

Adjectives

démenti (past participle) - denied

Related

mensonge (m) - a lie
menteur (m) - a liar
dément (adj/n) - insane (distantly related root)

Memorize It

Mnemonic

Think of 'DE-MENTIR' as 'DE-LYING'. You are 'undoing a lie' by telling everyone it's false.

Visual Association

Imagine a giant red 'X' stamp being slammed onto a newspaper headline. That action is 'démentir'.

Word Web

vérité journalisme rumeur nier officiel preuve faits communiqué

Challenge

Try to find one news article today in a French newspaper that uses the word 'démentir' or 'démenti'. Write down the sentence.

Word Origin

From the Latin 'dementiri' (to lie, to feign), which is composed of the prefix 'de-' (reversal or intensity) and 'mentiri' (to lie).

Original meaning: In Old French, it meant to accuse someone of lying or to prove that someone has lied.

Romance (Latin-based).
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