How to Say "sincerely" in Spanish
The most common Spanish word for “sincerely” is “atentamente” — use 'atentamente' exclusively as a formal closing in letters or emails, similar to 'yours faithfully' or 'sincerely' in English..
atentamente
/ah-ten-tah-MEN-teh//atenˈtamente/

Examples
Atentamente, María García.
Sincerely, María García.
Atentamente, Juan Pérez.
Sincerely, Juan Pérez.
Le saluda atentamente la gerencia.
Sincerely, the management.
Using 'atentamente' alone
In emails, you can use this word just like 'Sincerely' in English—put it on its own line followed by a comma and your name.
Don't use with friends
Mistake: “Using 'atentamente' in a text to a close friend.”
Correction: Use 'un abrazo' or 'besos' for friends. 'Atentamente' is very formal and would sound cold to a friend.
sinceramente
sin-seh-ra-MEN-tay/sinθeˈɾamente/

Examples
Sinceramente, no esperaba este resultado.
Sincerely, I didn't expect this outcome.
Sinceramente, creo que fue un error.
Honestly, I think it was a mistake.
Te agradezco sinceramente por venir a la fiesta.
I sincerely thank you for coming to the party.
Si me preguntas sinceramente, no me gusta su nueva canción.
If you ask me frankly, I don't like his new song.
Forming Adverbs
Spanish adverbs often end in '-mente.' You form them by taking the feminine form of an adjective (sincera) and adding '-mente.' This ending is like adding '-ly' in English.
Placement
Adverbs of manner usually go after the verb they describe (Te agradezco sinceramente) or at the beginning of the sentence if they modify the whole idea (Sinceramente, creo...).
Omitting the Accent
Mistake: “Writing 'sinceramente' without the accent mark on the first 'e'.”
Correction: The accent on the original adjective 'sincero' or 'sincera' is lost when '-mente' is added, but the stress pattern remains the same: sin-ce-RA-men-te. However, the Real Academia Española dictates that *sinceramente* does not carry a written accent.
Formal Closings vs. Expressing Honesty
Related Translations
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