The Collaborative International Dictionary of English v.0.48:

Derogative \De*rog"a*tive\, a.
   Derogatory. -- De*rog"a*tive*ly, adv. [R.] --Sir T. Browne.

   Syn: belittling, depreciative, deprecatory, depreciatory,
        derogatory, detractive, detracting, slighting,
        pejorative, denigratory.
        [1913 Webster]

WordNet (r) 3.0 (2006):

derogative
    adj 1: expressive of low opinion; "derogatory comments";
           "disparaging remarks about the new house" [syn:
           derogative, derogatory, disparaging]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "derogative":
   abusive, back-biting, belittling, bitchy, calumniatory, calumnious,
   catty, censorious, contemptuous, contumelious, defamatory,
   deprecatory, depreciative, depreciatory, derisive, derisory,
   derogatory, detractory, disparaging, libelous, minimizing,
   pejorative, ridiculing, scandalous, scurrile, scurrilous,
   slanderous, slighting, vilifying