un·der·a·chiev·er /ˌʌndərəˈtʃiːvə $ -ər/ noun [countableC] GOOD ENOUGH#someone who does not do as well at school or at work as they could do if they worked harder 〔学习或工作上〕未充分发挥潜力者
—underachieve verb [intransitiveI]
—underachievement noun [uncountableU]