inolvidable
unforgettable
in-
not
+
olvidar
to forget
+
-able
able to be
Inolvidable means unforgettable and can be broken down as in-0 (not0) + olvidar1 (to forget1) + -able2 (able to be2), literally meaning 'not able to be forgotten'.
adjective
- unforgettableImpossible to forget; leaving a lasting impressionFue una experiencia inolvidable viajar por Europa. // Traveling through Europe was an unforgettable experience.