deprecative

[L. deprecativus: cf. F. déprécatif.]
Serving to deprecate; deprecatory.

Syn. -- belittling, derogatory, pejorative, disparaging, depreciative, deprecatory, depreciatory, detractive, detracting, slighting, denigratory, uncomplimentary.
[PJC]

-- Dep·re·ca·tive·ly, adv.

adjective

Tending or intending to belittle: deprecatory, depreciative, depreciatory, derogative, derogatory, detractive, disparaging, low, pejorative, slighting, uncomplimentary. See praise/blame.

The adjective has 2 meanings:

Meaning #1: tending to diminish or disparage
  Synonyms: belittling, deprecating, deprecatory, depreciative, depreciatory, slighting

Meaning #2: given to expressing disapproval