term:

Ingratitude

ingratitude n

: forgetfulness of or lack of appreciation for kindness or esp. a gift received NOTE: Under the civil law of Louisiana, a gift may be revoked on the ground of ingratitude if the recipient of the gift tries to kill the person who gave the gift, is guilty of cruelly mistreating or injuring the giver, or refuses the giver food when it is needed.

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.