Sombría translates to "somber" or "shadowy." It's a descriptive word that evokes a sense of darkness, gloom, or melancholy.
In the song, Thalia sings, "Borrando la oscura sombría de tu soledad" (Erasing the dark shadow of your loneliness). Here, sombría is used to personify loneliness as a dark, oppressive shadow that can be lifted, making it a poetic and impactful choice.
This song is a warm, encouraging message to a friend who has fallen in love with a woman named Maria. Thalia reassures her that love doesn't follow anyone's rules, and there's nothing to be ashamed of in how she feels.
She sings about how her friend's whole world changed once Maria came into her life, chasing away the loneliness she used to carry. The phrase "por amor al arte" ("for the love of art," or loosely "just because") becomes a gentle way of saying that love arrives however it arrives, and that's worth celebrating rather than questioning.
By the end, Thalia tells her friend to stop overthinking it. If Maria loves her back, that's all that matters. The song is a tender show of support for a friend discovering she's in love with a woman.