没出息 is a fixed phrase meaning 'to lack prospects' or 'to be a disappointment', commonly used as a criticism in Chinese culture, especially from parents to children. It implies someone is lazy, unmotivated, or failing to meet expectations. In scolding contexts, it functions almost like an interjection: 'Shame on you!' or 'You're hopeless!'. Although grammatically a verb-object structure (没 'not have' + 出息 'prospects'), in practice it is rarely split.