We found 8 dictionaries that define the word underachieves:

General (7 matching dictionaries)

1. underachieves: Merriam-Webster
2. underachieves: Collins English Dictionary
3. underachieves: Vocabulary.com
4. underachieves: Cambridge Advanced Learner's Dictionary
5. underachieves: Wiktionary
6. underachieves: Dictionary.com
7. underachieves: TheFreeDictionary.com

Medicine (1 matching dictionary)

8. underachieves: Merriam-Webster Medical Dictionary

(Note: See underachieve as well.)

Definitions from Wiktionary (underachieve) ▸ verb:  To achieve less than expected; to fail to fulfil one's potential. ▸ Also see underachieve Opposite: overachieves, excels, succeeds, exceeds ▸ Words similar to underachieves ▸ Usage examples for underachieves ▸ Idioms related to underachieves ▸ Wikipedia articles (New!) ▸ Words that often appear near underachieves ▸ Rhymes of underachieves ▸ Invented words related to underachieves