Maldade translates to "evil" or "wickedness". It's a strong and evocative word that isn't commonly found in every romantic song, making it stand out.
In the context of the song, the singer uses it to express the profound pain caused by a loved one's departure, stating, "Já não tem como chorar tanta maldade" (There's no way to cry so much wickedness). This highlights the depth of betrayal or hurt felt, elevating the emotional intensity beyond simple sadness.