How to Say "faithful" in Spanish
The most common Spanish word for “faithful” is “fiel” — use 'fiel' when emphasizing loyalty and unwavering commitment to a person, cause, or belief, often highlighting a deep emotional bond or steadfastness..
fiel
/fyél//fjel/

Examples
Mi perro es el animal más fiel que conozco.
My dog is the most faithful animal I know.
Hicieron una traducción fiel del documento original.
They made an accurate translation of the original document.
Ella fue una socia fiel de la empresa durante veinte años.
She was a loyal partner of the company for twenty years.
Gender Invariability
Unlike many Spanish adjectives, 'fiel' has the same form whether describing a masculine thing ('el amigo fiel') or a feminine thing ('la amiga fiel').
Plural Form
To make 'fiel' plural, simply add '-es': 'fieles'. This applies to both masculine and feminine nouns (e.g., 'amigos fieles', 'copias fieles').
Confusing Fiel and Leal
Mistake: “Using 'leal' when referring to accuracy (e.g., 'una copia leal').”
Correction: Use 'fiel' when talking about accuracy or truthfulness (e.g., 'una copia fiel'). 'Leal' is reserved almost exclusively for loyalty to a person or group.
leal
leh-AHL/leˈal/

Examples
Mi perro es muy leal y nunca se separa de mí.
My dog is very loyal and never leaves my side.
Necesitamos un equipo de trabajo leal para completar este proyecto difícil.
We need a loyal work team to complete this difficult project.
A pesar de las dificultades, siempre se mantuvo leal a sus principios.
Despite the difficulties, he always remained true to his principles.
Adjective Agreement (Gender)
Since 'leal' ends in a consonant ('l'), it uses the exact same form whether you are describing a masculine person/thing (un amigo leal) or a feminine person/thing (una amiga leal). It doesn't change from 'leal' to 'leala'.
Adjective Agreement (Number)
To make 'leal' plural (meaning more than one), you must add '-es': 'los amigos leales' (the loyal friends) and 'las amigas leales'.
Forgetting the Plural Ending
Mistake: “Mis padres son muy leal.”
Correction: Mis padres son muy leales. (Always remember to add '-es' when describing plural nouns, even if the singular form doesn't change for gender.)
Fiel vs. Leal: The Nuance
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