The Collaborative International Dictionary of English v.0.48:

Untamed \Untamed\
   See tamed.

WordNet (r) 3.0 (2006):

untamed
    adj 1: in a natural state; not tamed or domesticated or
           cultivated; "wild geese"; "edible wild plants" [syn:
           wild, untamed] [ant: tame, tamed]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "untamed":
   Gothic, Neanderthal, animal, atrocious, barbarian, barbaric,
   barbarous, bestial, bloody, brutal, brutish, feral, ferine,
   ferocious, fierce, ill-bred, impolite, inhuman, kill-crazy, malign,
   malignant, merciless, murderous, noncivilized, outlandish,
   pitiless, primitive, rough-and-ready, ruthless, sanguinary, savage,
   tameless, troglodytic, unbroken, uncivil, uncivilized, uncombed,
   unconquered, uncontrollable, uncouth, uncultivated, uncultured,
   undomesticated, unenthralled, ungentle, ungoverned, unkempt,
   unlicked, unpolished, unquelled, unrefined, unsubdued, unsubject,
   unvanquished, vicious, wild