The Collaborative International Dictionary of English v.0.48:

Beggar \Beg"gar\, v. t. [imp. & p. p. Beggared; p. pr. & vb.
   n. Beggaring.]
   1. To reduce to beggary; to impoverish; as, he had beggared
      himself. --Milton.
      [1913 Webster]

   2. To cause to seem very poor and inadequate.
      [1913 Webster]

            It beggared all description.          --Shak.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "beggared":
   beggarly, bereaved, bereft, broke, deprived, destitute,
   disadvantaged, flat, fleeced, fortuneless, ghettoized, impecunious,
   impoverished, in need, in rags, in want, indigent, mendicant,
   necessitous, needy, on relief, out at elbows, pauperized,
   poverty-stricken, starveling, stripped, underprivileged