Inesorabile translates to "inexorable" or "relentless". It's a strong, evocative word that isn't commonly found in everyday conversation or many pop songs.
In "La Luna Piena", Jovanotti uses it to describe the arrival of nostalgia: "Che arriva inesorabile / Come il conto a fine cena" (Which arrives inexorable / Like the bill at the end of dinner). This comparison vividly portrays nostalgia as an unavoidable and persistent force, making the word particularly impactful in the song's context.
"La Luna Piena" ("The Full Moon") is Jovanotti's meditation on being left alone after a relationship ends. The song opens with the quiet after everyone has gone, when the only sounds left are the small mechanical noises of nostalgia creeping in, as unavoidable and ordinary as the bill arriving at the end of dinner.
From there the singer moves through the city at night: an empty subway car, streetlights strobing past the window, his head resting against the glass. He imagines the pain flowing out of him like blood from a vein, learning the hard way just how much it hurts. Even the city he loves turns hostile, its posters and mirrors reflecting a version of himself he doesn't recognize.
The full moon becomes the song's central image for all of it at once: comfort and grief, tenderness and rage. It crashes down on him, white as a bone, carrying the weight of a lost war. It is hard enough to shatter his heart, loaded with his own resentment, yet somehow also the one thing that will console him from now on. By the end it swells like a balloon slipping from a child's hand, false and beautiful, an exterminator of starry skies. It is heartbreak rendered as something you can watch rise every night.