The Collaborative International Dictionary of English v.0.48:

Blasphemous \Blas"phe*mous\, a. [L. blasphemus, Gr. ?.]
   Speaking or writing blasphemy; uttering or exhibiting
   anything impiously irreverent; profane; as, a blasphemous
   person; containing blasphemy; as, a blasphemous book; a
   blasphemous caricature. "Blasphemous publications."
   --Porteus.
   [1913 Webster]

         Nor from the Holy One of Heaven
         Refrained his tongue blasphemous.        --Milton.
   [1913 Webster]

   Note: Formerly this word was accented on the second syllable,
         as in the above example.
         [1913 Webster]

WordNet (r) 3.0 (2006):

blasphemous
    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]
    2: characterized by profanity or cursing; "foul-mouthed and
       blasphemous"; "blue language"; "profane words" [syn:
       blasphemous, blue, profane]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "blasphemous":
   Rabelaisian, abusive, apostate, atheistic, backsliding,
   calumniatory, calumnious, comminatory, contumelious, cursing,
   damnatory, denunciatory, dirty, disrespectful, dysphemistic,
   epithetic, evil, excommunicative, excommunicatory, execratory,
   fallen, fallen from grace, foul, fulminatory, impious, imprecatory,
   iniquitous, irreligious, irreverent, lapsed, maledictory, obscene,
   profanatory, profane, raw, recidivist, recidivistic, recreant,
   renegade, ribald, risque, sacrilegious, scatologic, scurrile,
   scurrilous, sinful, undutiful, vile, vituperative, wicked