defaulter
/dɪˈfɔːltə(r)/noun
1- a person who fails to fulfil a duty, obligation, or undertaking, especially to pay a tax or other debt违约者, 不履行义务者; 拖欠者。
1.1
- a person who fails to complete a course of medical treatment中止治疗的患者。
1.2
- chiefly Brit. a member of the armed forces guilty of a military offence〈主英〉违反军规者。