Desgraciada translates to "unfortunate" or "wretched," but it carries a much stronger emotional weight in Spanish than its direct English equivalents.
In the context of the song, the speaker warns, "Pero si acabas conmigo, vas a ser desgraciada" (But if you end up with me, you're going to be wretched/unfortunate). It implies a deep sense of misery or bad luck that will befall the person, making it a dramatic and memorable word choice that hints at the song's darker themes.
Fangoria's "Santos Que Yo Te Pinte" is a really direct and powerful song about a relationship where one person feels completely misunderstood and unappreciated. The singer isn't taking any blame for their partner's unhappiness, stating, "Yo no tengo la culpa / De que te duela el alma" [I'm not to blame / For your soul hurting]. It seems like the partner is lost, with the singer asking, "Dime dónde has estado / Niña de cara blanca / Dónde has dejado tu risa" [Tell me where you've been / Girl with the white face / Where have you left your laugh?].
The core of the song is this intense warning: "Santos que yo te pinte / Demonios se tienen que volver" [Saints that I painted for you / They have to turn into demons]. It's a blunt way of saying that if the relationship ends, all the good things the singer saw in their partner will turn bad. The singer is clear they aren't perfect, "Yo no soy ningún ángel / Yo no soy ningún santo" [I'm no angel / I'm no saint], but they're also convinced that no one will love their partner as much as they have: "Que como yo te he querido / No va a quererte nadie" [Because no one will love you / Like I have loved you]. It's a dramatic, almost defiant declaration of love and a warning of what will be lost.