The Collaborative International Dictionary of English v.0.48:

Risqu'e \Ris`qu['e]"\, a. masc., Risqu'ee \Ris`qu['e]e"\, a.
   fem., (r[-e]s`k[asl]"). [F., p.p. of risquer to risk.]
   Hazardous; risky; esp., fig., verging upon impropriety;
   dangerously close to, or suggestive of, what is indecent or
   of doubtful morality; as, a risqu['e] story. --Henry Austin.
   [Webster 1913 Suppl.]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "risque":
   Rabelaisian, abusive, bawdy, blasphemous, blue, broad,
   calumniatory, calumnious, comminatory, contumelious, cursing,
   damnatory, daring, denunciatory, dirty, dysphemistic, epithetic,
   erotic, excommunicative, excommunicatory, execratory, foul,
   fulminatory, gross, imprecatory, improper, indecent, indecorous,
   maledictory, obscene, off color, off-color, profane, purple, racy,
   raw, ribald, risky, salacious, salty, scabrous, scatologic,
   scurrile, scurrilous, sexy, shady, spicy, suggestive, unrefined,
   vile, vituperative, wicked