Usage Note
Inolvidable is formed from the prefix in- (not) + olvidable (forgettable), from olvidar (to forget). It is one of the most common superlative-style adjectives in Spanish song and film titles. As an -able/-ible adjective it does not change for gender, only for number: momentos inolvidables.
Examples
"Fue una noche inolvidable para todos."
Natural Translation
It was an unforgettable night for everyone.

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