How to Say "untruth" in Spanish
The Spanish word for “untruth” is “falsedad” — B1 level.
English → SpanishB1
nounB1
lack of truth

Examples
La noticia estaba llena de falsedades sobre el presidente.
The news was full of falsehoods about the president.
Es una falsedad absoluta decir que yo no estuve allí.
It is an absolute untruth to say that I wasn't there.
No podemos permitir que esta falsedad se difunda más.
We cannot allow this falsehood to spread any further.
Always Feminine
Spanish words ending in '-dad' (like truth, city, or falsehood) are always feminine. Always use 'la' or 'una' with this word.
Don't use 'el'
Mistake: “El falsedad es malo.”
Correction: La falsedad es mala. (Nouns ending in -dad are feminine, and adjectives must match).
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