malingerer

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. [ 1913 Webster ]