Infiel means 'unfaithful' or 'cheater'. It's a direct and impactful word that immediately sets the tone for the song's narrative of betrayal and heartbreak.
In the context of the song, Marília Mendonça uses "Infiel" as a powerful accusation and a central theme. The entire song revolves around the consequences of infidelity, making this word not just a title, but the very essence of the story being told. It's memorable because it's the song's title and encapsulates the raw emotion of the lyrics.
This song is one of the most direct breakup anthems you'll ever hear. Marília Mendonça isn't singing about her sadness; she's confronting the other woman and kicking her cheating partner out for good. She starts by telling the woman, "Isso não é uma disputa" [This isn't a competition], making it clear she's not fighting for this man. In fact, she's handing him over, calling him "O seu prêmio que não vale nada" [Your prize that's worth nothing]. She's already packed his bags and thrown him out.
The best part is how she warns the other woman what she's getting into. She says the man will only go to her because he's "sem casa, sem rumo" [homeless, aimless] and she's his only choice. The chorus is a direct message to her ex: "Infiel / Eu quero ver você morar num motel" [Unfaithful / I want to see you living in a motel]. She finishes by predicting he'll do the exact same thing to his new partner, because "Você não vai mudar" [You won't change]. It's a powerful story of someone taking back control after being betrayed.