Deserter (noun)

1. A person who deserts a place, organization, or duty, especially a military one.
2. A person who abandons something or someone and fails to fulfill an obligation.

Origin:

Late middle english: from old french deserteur, from latin deseritor, from deserere "abandon, desert".

Examples:

1. He was considered a deserter for leaving his post during battle.
2. The soldier was labeled as a deserter for abandoning his unit.
3. The employee was considered a deserter for leaving the company without notice.
4. The deserter was arrested and charged with desertion.
5. The deserter was stripped of his rank and dishonorably discharged.