The Collaborative International Dictionary of English v.0.48:

Unmitigated \Unmitigated\
   See mitigated.

WordNet (r) 3.0 (2006):

unmitigated
    adj 1: not diminished or moderated in intensity or severity;
           sometimes used as an intensifier; "unmitigated
           suffering"; "an unmitigated horror"; "an unmitigated lie"
           [ant: mitigated]

Moby Thesaurus II by Grady Ward, 1.0:

149 Moby Thesaurus words for "unmitigated":
   absolute, admitting no exception, all-embracing, all-encompassing,
   all-out, all-pervading, altered, arrant, better, born, broad-based,
   categorical, changeable, changed, classical, clean, clear,
   complete, comprehensive, conclusive, congenital, consummate,
   converted, crass, decided, decisive, deep-dyed, definite,
   definitive, degenerate, determinate, deviant, divergent, downright,
   dyed-in-the-wool, egregious, entire, exhaustive, explicit, express,
   final, fixed, flagrant, flat, flat-out, glaring, global, gross,
   immoderate, implicit, improved, inappealable, indisputable,
   intensive, intolerable, metamorphosed, metastasized, modified,
   mutant, omnibus, omnipresent, oppressive, out-and-out, outright,
   peremptory, perfect, pervasive, plain, plumb, positive, precious,
   profound, pronounced, proper, pure, qualified, radical, rank,
   rebuilt, reformed, regular, relentless, renewed, revived,
   revolutionary, round, shattering, sheer, shocking, stark,
   stark-staring, straight, straight-out, subversive, superlative,
   surpassing, sweeping, the veriest, thorough, thoroughgoing,
   through-and-through, total, transformed, translated, transmuted,
   true, ubiquitous, unabated, unallayed, unalloyed, unbearable,
   uncircumscribed, unconditional, unconditioned, unconscionable,
   undeniable, undiluted, undiminished, undoubting, unequivocal,
   unextinguished, unhampered, unhesitating, universal, unlimited,
   unmistakable, unmixed, unmodified, unqualified, unquelled,
   unquenched, unquestioning, unreduced, unrelieved, unreserved,
   unrestricted, unretarded, unsoftened, unspoiled, unsubdued,
   untempered, unwaivable, utter, veritable, whole, wholesale,
   without exception, without reserve, worse