1. He proved himself to be a thowless student by consistently skipping classes and failing exams.
他因为经常旷课和考试不及格而被证明是个懒散的学生。
2. The thowless employee never met deadlines and constantly made careless mistakes.
这个不负责任的员工从不按时完成任务，而且经常犯低级错误。