How to Say "lying" in Spanish
The most common Spanish word for “lying” is “mintiendo” — use 'mintiendo' when referring to the ongoing action of telling a lie or deceiving someone in the present moment..
mintiendo
min-tee-EN-doh/minˈtjen.do/

Examples
Creo que me estás mintiendo sobre dónde estuviste anoche.
I think you are lying to me about where you were last night.
Él siempre estuvo mintiendo para evitar meterse en problemas.
He was always lying to avoid getting into trouble.
Ella niega estar mintiendo, pero su cara dice lo contrario.
She denies being dishonest, but her face says otherwise.
Forming Continuous Actions
Use 'mintiendo' with a form of the verb 'estar' (like 'estoy,' 'estás,' etc.) to describe an action that is happening now: 'Estoy mintiendo' (I am lying).
The E→I Change
'Mintiendo' is irregular because the 'e' in the stem of 'mentir' changes to an 'i' instead of the more common 'ie' change found in the present tense (like 'miento').
Forgetting the Stem Change
Mistake: “Me estás *mentiendo*.”
Correction: Me estás *mintiendo*. Remember that -ir verbs that stem-change in the present tense (like *mentir*) always change e→i in the gerund.
mentiroso
men-tee-ROH-so/mentiˈroso/

Examples
Su excusa era tan mentirosa que nadie le creyó.
His excuse was so untruthful that nobody believed him.
El informe parecía mentiroso y lleno de errores.
The report seemed misleading and full of errors.
Matching Gender
As an adjective, 'mentiroso' must change its ending to match the person or thing it describes. Use 'mentiroso' for masculine things and 'mentirosa' for feminine things.
Forgetting the Gender Change
Mistake: “Ella es mentiroso.”
Correction: Ella es mentirosa. (You must match the 'a' ending to the female subject 'Ella'.)
Action vs. Characteristic
Related Translations
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