underachievement
🇺🇸
/ˌʌndərəˈtʃiːvmənt/
🇬🇧
/ˌʌndərəˈtʃiːvmənt/
Performing at a lower level than one is capable of, especially in school.
The teacher was concerned about the student's underachievement in math.
老师对学生在数学上的低成就表示担忧。