Goneril is the eldest daughter in Shakespeare's King Lear.

Goneril treats her father well, until he becomes old, and gives her and her husband a plot of land and a lot of money. Then she starts treating him really crappily.

A girl, or guy, who is described as a Goneril, is someone who abuses and takes advantage of those who love him/her the most.
"My brother's daughter turned out to be such a Goneril. We haven't spoken with her since he died."
by queen.padme.amidala May 24, 2005
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