Pendente translates to "pending" or "outstanding". While it might seem common, its use here is particularly poignant and less frequent in song lyrics than everyday words.
In the song, the phrase "detalhe pendente" (pending detail) refers to the unresolved love between the couple. Even though their relationship ended, their feelings for each other are still "pending" or lingering, creating a powerful image of unfinished business in their hearts.
Have you ever broken up with someone, but your feelings just didn't get the memo? That's exactly what Felipe Amorim is singing about in "Detalhe Pendente"! It's all about that frustrating situation where the relationship is over, but the love is still very much alive. He asks, "Como é que a gente faz / Quando a relação acaba / E o sentimento não?" [How do we do it / When the relationship ends / And the feeling doesn't?]. It's like life keeps throwing you back together, even when you're trying to avoid each other, and everyone around you is talking about the other person. You're both swallowing those "eu te amo" [I love yous] and suffering in silence.
It's that feeling of trying to move on, but there's this one big "detalhe pendente" [pending detail]: "É que o amor não terminou junto com a gente" [It's that love didn't end with us]. So, if you've ever found yourself "não chora bebendo, bebe chorando" [not crying while drinking, but drinking while crying] because your heart just won't let go, this song is going to hit you right in the feels!