How to Say "truthful" in Spanish
The most common Spanish word for “truthful” is “honesto” — use 'honesto' to describe a person who consistently tells the truth and is generally trustworthy..
Examples
Mi padre siempre ha sido un hombre muy honesto.
My father has always been a very honest man.
sincero
sin-CEH-roh/sinˈse.ɾo/
Examples
Te doy mi opinión sincera, creo que deberías reconsiderarlo.
I give you my sincere opinion, I think you should reconsider it.
Mi abuela siempre fue una persona muy sincera.
My grandmother was always a very sincere person.
Te doy mi opinión más sincera sobre el proyecto.
I'm giving you my most honest opinion about the project.
Aunque la verdad era dolorosa, agradeció que el doctor fuera sincero.
Although the truth was painful, he appreciated that the doctor was truthful.
Adjective Agreement
As an adjective, 'sincero' must change its ending to match the noun it describes. Use '-a' for feminine nouns (sincera) and add '-s' for plural nouns (sinceros/sinceras).
Using 'Ser'
This word almost always pairs with the verb 'ser' (to be) because it describes a fundamental quality or personality trait: 'Ella es sincera' (She is sincere).
Forgetting Feminine Form
Mistake: “La profesora es sincero.”
Correction: La profesora es sincera. (Since 'profesora' is feminine, the adjective must end in -a.)
Honesto vs. Sincero
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