Source : Webster's Revised Unabridged Dictionary (1913)

Malingerer \Ma*lin"ger*er\, n. [F. malingre sickly, weakly,
   prob. from mal ill + OF. heingre, haingre, thin, lean,
   infirm, fr. L. aeger.]
   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.

Source : WordNet®

malingerer
     n : someone shirking their duty by feigning illness or
         incapacity [syn: {skulker}, {shammer}]