Malingering refers to a deliberate faking of a symptom or physical or psychological disorder for the purpose of avoiding an unwanted situation, such as military service and which is motivated by gain; intentional exaggeration or presentation of neuropsychological symptoms and fabrication of physical or psychological symptoms for some ulterior motive.
the conscious and intentional maintaining of the sick role for some material or financial gain; symptoms are intentionally produced by the individual to avoid some task, for advantage in legal actions, or to obtain disability status.
Other /More definition:
malingering refers to deliberate faking of a physical or psychological disorder motivated by gain.