The Collaborative International Dictionary of English v.0.48:

Imprecatory \Im"pre*ca*to*ry\, a.
   Of the nature of, or containing, imprecation; invoking evil;
   as, the imprecatory psalms.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "imprecatory":
   Rabelaisian, abusive, blasphemous, calumniatory, calumnious,
   comminatory, contumelious, cursing, damnatory, denunciatory, dirty,
   dysphemistic, epithetic, excommunicative, excommunicatory,
   execratory, foul, fulminatory, maledictory, obscene, profane, raw,
   ribald, risque, scatologic, scurrile, scurrilous, vile,
   vituperative