malingerer:
(plural: ‘malingerers‘; pronunciation: the letter ‘g’ rhymes with the letter ‘g’ in “gun” — for the two different pronunciations of this word, please click here)
a person who pretends to be sick to avoid responsibility, punishment, school, job, work/duty, or to claim for more money or special treatment,

a malingerer
Little Charlie is a great malingerer — whenever he wants to miss school, he malingers to be seriously ill, which sometime works but most of the time fails.
Employees are the best malingerers, only next to students, who seek medical attention, even going to the extent of bribing the doctors, to avoid irregular timings or responsibility at work place.
Most malingerers, according to psychologists, are those criminals who know something about the symptoms of certain diseases or who are advised/prepared by their lawyers to escape penalties, punishment, including death penalty.
As malingerers on their patients’ list are growing more, the doctors are trying to find ways to deter the malingerers; for example, by scribbling down in their observation chart that so and so patient is a malingerer and so needs no special medical leave.
