How to Say "perpetual" in Spanish
The most common Spanish word for “perpetual” is “eterna” — use 'eterna' when referring to something that is unending in a philosophical, spiritual, or abstract sense, often implying an ideal or divine quality..
eterna
eh-TEHR-nah/eˈteɾna/

Examples
La esperanza de una vida eterna es un consuelo para muchos.
The hope of an eternal life is a comfort for many.
Después de tres horas de retraso, la espera se hizo eterna.
After a three-hour delay, the wait became endless (or seemed eternal).
Ella siente una gratitud eterna por tu ayuda.
She feels eternal gratitude for your help.
Adjective Agreement (Feminine)
Since 'eterna' ends in '-a', it is used to describe feminine nouns (like 'vida' or 'espera'). If you were describing a masculine noun (like 'amor'), you would use 'eterno'.
Placement
Like most adjectives, 'eterna' usually goes after the noun (la vida eterna). Placing it before the noun (la eterna vida) often adds poetic emphasis.
Mismatching Gender
Mistake: “La espera fue eterno.”
Correction: La espera fue eterna. (Since 'espera' is feminine, the adjective must also be feminine.)
perpetua
/per-PEH-twah//peɾˈpetwa/

Examples
Las cumbres de los Alpes tienen nieve perpetua.
The peaks of the Alps have perpetual snow.
Buscaba una solución perpetua para el problema.
He was looking for a permanent solution to the problem.
Matching Gender
'Perpetua' is the feminine form. Use it only when describing feminine things, like 'la nieve' or 'la paz'.
Choosing Between 'Eterna' and 'Perpetua'
Related Translations
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