malingerer       
noun [ C ]  disapproving uk/məˈlɪŋ.ɡər.ər/ us/məˈlɪŋ.ɡɚ.ɚ/
 装病不工作的人
a person who pretends to be ill in order to avoid having to work
  I'm sure she thinks I'm a malingerer. 她肯定觉得我装病不干活。 
 Psychological tests performed by experts can often identify malingerers.  由专家进行的心理测试通常可以识别装病的人。 
 See: malinger
 - More examples
 - He was a malingerer who feigned illness.
 - People thought that he could possibly be a malingerer.
 - It can be difficult for commanders to tell the malingerers from the truly ill.