The Collaborative International Dictionary of English v.0.48:

Sacrilegious \Sac`ri*le"gious\, a. [From sacrilege: cf. L.
   sacrilegus.]
   Violating sacred things; polluted with sacrilege; involving
   sacrilege; profane; impious.
   [1913 Webster]

         Above the reach of sacrilegious hands.   --Pope.
   [1913 Webster] -- Sac`ri*le"gious*ly, adv. --
   Sac`ri*le"gious*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sacrilegious
    adj 1: grossly irreverent toward what is held to be sacred;
           "blasphemous rites of a witches' Sabbath"; "profane
           utterances against the Church"; "it is sacrilegious to
           enter with shoes on" [syn: blasphemous, profane,
           sacrilegious]

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "sacrilegious":
   aberrant, abnormal, abominable, apostate, atheistic, atrocious,
   backsliding, blasphemous, criminal, delinquent, deviant,
   disgraceful, disrespectful, evil, fallen, fallen from grace,
   hardly the thing, heretical, ignominious, illegal, impious,
   improper, inappropriate, incorrect, indecorous, infamous,
   irreligious, irreverent, lapsed, not done, not the thing, off-base,
   off-color, out-of-line, profanatory, profane, recidivist,
   recidivistic, recreant, renegade, scandalous, shameful, shameless,
   sinful, terrible, undue, undutiful, unfit, unfitting, ungodly,
   unlawful, unrighteous, unseemly, unsuitable, wicked, wrong,
   wrongful