The Collaborative International Dictionary of English v.0.48:

Intrinsically \In*trin"sic*al*ly\, adv.
   Internally; in its nature; essentially; really; truly.
   [1913 Webster]

         A lie is a thing absolutely and intrinsically evil.
                                                  --South.
   [1913 Webster]

WordNet (r) 3.0 (2006):

intrinsically
    adv 1: with respect to its inherent nature; "this statement is
           interesting per se" [syn: intrinsically, per se, as
           such, in and of itself]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "intrinsically":
   by birth, by nature, centrally, characteristically, congenitally,
   deeply, distinctively, genetically, immanently, inly, innately,
   interiorly, internally, intimately, inwardly, like no other,
   markedly, naturally, originally, peculiarly, primally, primitively,
   profoundly, singularly, under the surface, uniquely