WordNet (r) 3.0 (2006):

poor devil
    n 1: someone you feel sorry for [syn: poor devil, wretch]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "poor devil":
   Bowery bum, almsman, almswoman, bankrupt, beachcomber, beggar,
   beggarly fellow, blighter, budmash, bum, bummer, caitiff, casual,
   charity case, derelict, devil, down-and-out, down-and-outer,
   drifter, drunkard, good-for-naught, good-for-nothing, hardcase,
   hobo, human wreck, indigent, lowlife, martyr, mauvais sujet,
   mean wretch, mucker, no-good, object of compassion, pauper,
   pauvre diable, penniless man, pilgarlic, poor creature, poor man,
   poorling, prey, sad case, sad sack, skid-row bum, starveling,
   stiff, sufferer, sundowner, swagman, tramp, truant, vag, vagabond,
   vagrant, vaurien, victim, wastrel, welfare client,
   worthless fellow, wretch