How to Say "eternal" in Spanish
The Spanish word for “eternal” is “eterno” — C1 level. This is a very common word in everyday Spanish.
English → SpanishC1
AdjectiveC1
never-ending existence

Examples
Dicen que el alma es eterna y nunca muere.
They say the soul is eternal and never dies.
La búsqueda de la felicidad eterna es un tema filosófico.
The search for everlasting happiness is a philosophical topic.
Gender and Number
Remember to change the ending to match the noun: 'eterno' (masculine singular), 'eterna' (feminine singular), 'eternos' (masculine plural), and 'eternas' (feminine plural).
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