How to Say "sincerity" in Spanish
The Spanish word for “sincerity” is “sinceridad” — B1 level. This is a very common word in everyday Spanish.

Examples
Aprecio mucho tu sinceridad.
I really appreciate your sincerity.
Él habló con total sinceridad sobre sus errores.
He spoke with total honesty about his mistakes.
La sinceridad es importante en una relación.
Sincerity is important in a relationship.
Always Feminine
Words ending in '-dad' in Spanish are almost always feminine, so you should use 'la' or 'una' with this word.
Sincerity vs. Honesty
Mistake: “Using 'honestidad' only when you mean someone doesn't lie.”
Correction: While similar, 'sinceridad' is better when describing the quality of being open about your feelings, whereas 'honestidad' often refers to integrity or not stealing.
Related Translations
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