How to Say "liar" in Spanish
The most common Spanish word for “liar” is “mentiroso” — use 'mentiroso' when referring to a person who habitually tells lies or has just told a lie.
mentiroso
men-tee-ROH-somentiˈroso

Examples
¡No le creas! Es un mentiroso.
Don't believe him! He is a liar.
Mi hijo dijo que no era un mentiroso, pero tenía chocolate en la cara.
My son said he wasn't a liar, but he had chocolate on his face.
The Female Liar
If you are referring to a woman, the noun changes to 'la mentirosa.' The concept is the same, but the word must match her gender.
cha
ch-ahtʃa

Examples
¡Cha! Tú no corriste cinco kilómetros.
Yeah, right! You didn't run five kilometers.
Dijo que es amigo de Messi. ¡Chá!
He said he's friends with Messi. Yeah, right!
¡Chá, no te creo nada!
Liar, I don't believe you at all!
The Disbelief Sound
In Chile, this word is often pronounced with a sharp, rising tone (sometimes written as 'Chá') to show you think someone is exaggerating.
Wrong Region
Mistake: “Using 'cha' to mean 'yeah right' in Mexico.”
Correction: In Mexico, people might not understand this; use '¡Ajá!' or '¡Sí, cómo no!' instead.
Using 'cha' for a habitual liar
Related Translations
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