She thinks her son is completely good-for-nothing.
Tips
usage
没出息 is a common colloquial insult, often used by parents or elders scolding younger people. 出息 means 'prospects/potential', so 没出息 = 'no prospects'. The positive form 有出息 (yǒu chūxi) means 'promising/ambitious'.
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Informal and somewhat harsh. Often used within families or between close friends, not typically in formal settings.
