1. A narrative or plot in a story, film, book, or other media that lacks sufficient depth, complexity, or character development
The movie suffered from an underdeveloped storyline that left audiences confused about the main character's motivations.
O filme sofreu com uma trama pouco desenvolvida que deixou a audiência confusa sobre as motivações do personagem principal.
2. A secondary or subplot that is not adequately explored or given enough attention in a narrative
Critics complained about the underdeveloped storyline involving the protagonist's family.
Os críticos reclamaram sobre a trama pouco desenvolvida envolvendo a família do protagonista.