How to Say "loyal" in Spanish
The most common Spanish word for “loyal” is “fiel” — use 'fiel' when describing constant support or unwavering devotion, often applied to pets, ideals, or the concept of faithfulness itself.
fiel
fyélfjel

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-AHLleˈal

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: People or Pets?
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