You searched for: “abdicant”
abdicant (s) (noun), abdicants (pl)
Anyone who abandons or renounces a position or responsibility: The king became an abdicant when he gave up his throne so his son could take his place.
abdicant (AB di kuhnt) (adjective), more abdicant, most abdicant
A description of someone who has forsaken or has deserted his or her responsibility: Roger Smith's abdicant behavior regarding his duties did not go well with his fellow administrators.