/bækˈslaɪdər/
NOUN
A person who turns away from religious beliefs or practices, or returns to morally or spiritually undesirable behavior after previously following a religious or moral path.
A person who abandons, rejects, or turns away from previously held religious beliefs, faith, or religious commitments.
A person who returns to undesirable, sinful, or morally unacceptable conduct after a period of improvement or commitment to better behavior.
NOUN
A person who deserts a cause, breaks a commitment, betrays someone, or abandons responsibilities or affiliations.
A person who betrays the trust of others, abandons an alliance, or acts disloyally toward someone or a group.
A person who abandons a duty, position, organization, or commitment, particularly by leaving without fulfilling an obligation.