wild man

from WordNet (r) 3.0 (2006)

wild man
    n 1: a person who is not socialized [syn: {wild man}, {feral
         man}]

from Moby Thesaurus II by Grady Ward, 1.0

27 Moby Thesaurus words for "wild man":
      adventurer, adventuress, animal, anthropophagite, barbarian, beast,
      brazenface, brute, cannibal, daredevil, destroyer, devil,
      fire-eater, harum-scarum, hellcat, hotspur, hyena, madbrain,
      madcap, man-eater, nihilist, rantipole, savage, shark, tiger,
      vandal, wrecker