How to Say "never-ending" in Spanish
The Spanish word for “never-ending” is “eterno” — B2 level. This is a very common word in everyday Spanish.

Examples
La reunión se hizo eterna, duró casi tres horas.
The meeting became endless; it lasted almost three hours.
Ese eterno problema de tráfico nunca se soluciona.
That constant traffic problem is never solved.
Mi hermana es la eterna optimista, siempre ve el lado bueno.
My sister is the eternal optimist; she always sees the bright side.
Emphasis Placement
When 'eterno' is used figuratively (meaning 'constant' or 'always present'), it often goes before the noun, like in 'el eterno dilema' (the constant dilemma).
Confusing 'Constant' and 'Forever'
Mistake: “Using 'eterno' when you just mean 'frequent' or 'long'.”
Correction: Use 'largo' (long) or 'frecuente' (frequent) unless you want the strong exaggeration 'eterno'.
Related Translations
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