- perform less well or with less success than expected; "John consistently underachieves, although he is very able"; "My stocks underperformed last year"
- (underachievement) poorer than expected performance (poorer than might have been predicted from intelligence tests)
- (Underachieving) A discrepancy between recognized potential and actual academic performance. The causes of underachievement may be social, emotional, physical, and/or academic. A good program serves all of its gifted students, not just those who are achieving. ...