[1] : The Collaborative International Dictionary of English v.0.48

unhallowed \unhal"lowed\, a. pref. un- not + hallowed.
   not consecrated; hence, profane; unholy; impious; wicked.
   1913 webster

         in the cause of truth, no unhallowed violence . . . is
         either necessary or admissible.          --e. d.
                                                  griffin.
   1913 webster

[2] : WordNet (r) 2.0

unhallowed
     adj : not hallowed or consecrated syn: unholy ant: holy
see also:
unholy holy 

[3] : Moby Thesaurus II by Grady Ward, 1.0

21 moby thesaurus words for "unhallowed":
   demoniac, demonic, devilish, diabolic, fleshly, irreverent,
   mundane, nonsacred, profane, reprobate, satanic, secular,
   serpentine, temporal, unblessed, ungodly, unholy, unregenerate,
   unsacred, unsanctified, worldly

Unhallowed >> U Words
Unhallowed, definition of term: Unhallowed
unhallowed_pag1.html