Malingerer n. In the army, a soldier who feigns himself sick, or who induces or protracts an illness, in order to avoid doing his duty; hence, in general, one who shirks his duty by pretending illness or inability.
... stranger, and many turned to look at me. Such as had illnesses came to the doctor, and he looked at their tongues and felt their pulse, giving directions to an assistant who stood beside him with a note-book. Don Felipe was on excellent terms with his patients, laughing and joking; a malingerer asked if he could not have a little wine because his throat was sore; the doctor jeered and the man began to laugh; they bandied repartees ... — The Land of The Blessed Virgin; Sketches and Impressions in Andalusia • William Somerset Maugham