How to Say “You’re a Liar” in Spanish

eres un mentiroso
/eɾes un mentiɾoso/from spelling rules
The English phrase "you're a liar" is translated into Spanish as eres un mentiroso.
This phrase is used to tell someone that they have not told the truth by identifying them as a liar.

Which one should you use?

The phrase eres un mentiroso identifies the person as a liar (a noun), whereas the verb mientes means "you are lying".

Is it said differently in some regions?

In some Latin American countries, such as Mexico and Colombia, the word embustero is used to denote someone as a liar.

How does it change in a sentence?

If the person you are addressing is female, you must change the masculine article and noun to the feminine forms, resulting in eres una mentirosa.

How do you pronounce it?

/eɾes un mentiɾoso/

Did you know?

  • The verb eres in this phrase is actually a linguistic survivor from the Latin future tense, meaning 'you will be', which replaced the original Latin present tense form in Spanish.
  • In many Spanish-speaking cultures, calling someone a mentiroso in a playful tone during a game or a joke is a common way to express disbelief without actually accusing them of dishonesty.
  • Because mentiroso is an adjective acting as a noun, it carries a heavy weight of characterization, suggesting that lying is not just a single act but a fundamental part of the person's identity.

Examples in context

  • Creo que eres un mentiroso.
    I think you're a liar.
    This sentence shows how to express the opinion that someone is a liar using eres un mentiroso.
    Tatoeba #2720072 by Shishir, translation #2458565 by CK
  • Todos saben que eres un mentiroso.
    Everybody knows that you're a liar.
    This sentence is used to state that everyone is aware that someone is a liar using eres un mentiroso.
    Tatoeba #9827083 by ecorralest101, translation #7518629 by CK
  • Esto demuestra que tú eres un mentiroso.
    This proves you're a liar.
    This sentence is useful for stating that something serves as proof that someone is a liar using eres un mentiroso.
    Tatoeba #2469384 by marcelostockle, translation #13223447 by rul
  • Discúlpeme, pero usted es un mentiroso.
    Excuse me, but you're a liar.
  • No te creo, eres un mentiroso.
    I don't believe you, you're a liar.
  • 3 more sentences on Tatoeba

Example conversation

Sofía confronts Alejandro about a broken promise.

  1. Sofía

    Dijiste que vendrías hoy.
    You said you would come today.
  2. Alejandro

    Lo siento, tuve un problema.
    I'm sorry, I had a problem.
  3. Sofía

    No me creo nada, eres un mentiroso.
    I don't believe anything, you're a liar.
  4. Alejandro

    No es cierto, de verdad.
    That's not true, really.

Sources

  • IPA marked “from spelling rules” is derived from standard Spanish spelling, where Wiktionary gives none.
  • Word origins: Wiktionary entries eres, mentiroso, un, CC BY-SA 4.0.
  • Example sentences: Tatoeba CC BY 2.0 FR.
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Ava AshleyHelp make this guide better. Spot a mistake, know another way to say it, or have an example from real life? Share it below.
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