underachievement
un·de·rac·hievement
noun
1.
poorer than expected performance (poorer than might have been predicted from intelligence tests)
Origin
From under- + achievement.
Related words
Word family
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.