Source : Webster's Revised Unabridged Dictionary (1913)

Impoverish \Im*pov"er*ish\, v. t. [imp. & p. p. {Impoverished};
   p. pr. & vb. n. {Impoverishing}.] [OF. empovrir; pref. em-
   (L. in) + povre poor, F. pauvre; cf. OF. apovrir, F.
   appauvrir, where the prefix is a-, L. ad. Cf. {Empoverish},
   and see {Poor}, and {-ish}.]
   1. To make poor; to reduce to poverty or indigence; as,
      misfortune and disease impoverish families.

   2. To exhaust the strength, richness, or fertility of; to
      make sterile; as, to impoverish land.

Source : WordNet®

impoverished
     adj 1: poor enough to need help from others [syn: {destitute}, {indigent},
             {necessitous}, {needy}, {poverty-stricken}]
     2: destroyed financially; "the broken fortunes of the family"
        [syn: {broken}, {wiped out(p)}]