Somebody who abuses or tries to destroy any form of kindness, love, admiration, friendship, generosity or patience from you towards another human being.
A cheat liar or scammer that plays around and is
unfaithful or somebody that has no feelings for anybody other than themselves.
A company that offers you a product that is either not fit for purpose or a service that is below expected standards or
a cap wearing gold badge chasing employee who thinks
the buck stops there.
It could simply be a partner who has treated you so badly that they do not deserve a piece of your heart or a company that refuses to accept they are in the wrong and try everything within their powers to stop you achieving satisfaction.