Contraddico comes from the verb contraddire, meaning "to contradict". It's an interesting word because it highlights a moment of self-awareness and vulnerability in the song.
Adriano Celentano sings, "Io lo so mi contraddico, ma preziosa sei tu per me" (I know I contradict myself, but you are precious to me). This line reveals the complexity of his feelings, acknowledging that his actions or words might not always be consistent, especially when it comes to love and jealousy, yet his affection remains strong.
A man who cannot say the word tries to say it anyway. Celentano opens by admitting the problem outright, "Io non so parlar d'amore" ("I don't know how to speak of love"), and then blames the feeling itself: "L'emozione non ha voce" ("Emotion has no voice"). What follows is a list of things he can promise instead of poetry. He will be honest. He will stay who he is. "Disonesto mai lo giuro" ("Never dishonest, I swear it") arrives with a condition attached one line later, "Ma se tradisci non perdono" ("But if you betray me I won't forgive").
That mix of tenderness and flint runs through the whole song. He calls himself jealous and admits the contradiction in the same breath: "Io lo so mi contraddico" ("I know, I contradict myself"). Then the chorus stops arguing and just describes a room, "Tra le mie braccia dormirai" / "Serenamente" ("You'll sleep in my arms" / "Peacefully"). Two people who catch fire easily, "Due caratteri diversi" / "Prendon fuoco facilmente" ("Two different temperaments" / "catch fire easily"), and who add up to almost nothing when they are apart. The plan he ends on is small and unglamorous: honesty, love, trust, and "Poi sarà quel che sarà" ("then whatever will be, will be").