Other forms: deserters
Someone who abandons their responsibilities is a deserter. Being a military deserter is particularly serious, with harsh consequences.
Anyone who deserts a post or obligation, abandoning it in an irresponsible, disloyal way, is a deserter. Your friends may call you a deserter if you promise to help them rake leaves but wander home after 20 minutes to watch TV instead. In the military, being a deserter is nearly as bad as being a traitor. During wartime, deserters can face long prison sentences.