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1.
Person who fails to achieve his or her potential. Used often when refering to students.
My kid is an underachiever. He's not an idiot though.
von jakub777 24. Oktober 2008
 
2.
A female whose stomach petrudes farther outward from her body than her breasts.
Look at that fat chick with tiny boobs. What an under achiever!
von will_minnesota 9. Juli 2006
 
3.
The opposite of:

overachiever
44 up, 15 down
Someone who is sooo much better than you that it pisses you off.

I hate that fucking overachiever!

by Blah Aug 8, 2003 email it
Yeah so what if all I did was copy and paste the definition of overachiever. I'm a true underachiever.
von rappathered 25. März 2008
 
4.
A person who does not perform to one's expectations.

A person who disappoints.
Dr. Manmohan Singh Indian Prime Minister
as described very well by Time Magazine. He was depicted on the front page as underachiever.
von Shobit 29. September 2012