Endeble translates to "feeble" or "weak". It's a less common and more evocative word than simply saying "débil" (weak), adding a layer of vulnerability and fragility.
In the song, Ana Gabriel sings, "El dolor me vuelve endeble" (The pain makes me feeble). This powerful line conveys the profound impact of her unrequited love and the emotional toll it's taking on her, making her feel utterly powerless and delicate.
Ana Gabriel's "Y Tú No Estás" is a powerful song about unrequited love and the pain of a one-sided relationship. The singer feels unheard and unloved, constantly questioning her partner's sincerity with lines like "Siento que tu amor no es cierto, solo estás jugando" [I feel your love isn't real, you're just playing]. She's always quiet, never complaining, even as his distance hurts her more and more.
It's a really intense look at how much someone can suffer when they love someone who isn't there for them. She sings, "Ay, este amor me va a matar" [Oh, this love is going to kill me] and describes how the pain makes her weak: "El dolor me vuelve endeble, no puedo más" [The pain makes me weak, I can't go on]. Even when she's crying, alone, and calling out, he's silent and absent, leaving her to wonder, "Pero nadie me responde, tú no estás" [But no one answers me, you're not there].