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Adjective: deprecative  'de-pru,key-tiv [N. Amer], de-pri-ku-tiv [Brit]
  1. Given to expressing disapproval
    "Her deprecative comments about the performance discouraged the young actors"
     
  2. Tending to diminish or disparage
    "deprecative comments";
    - belittling, deprecating, deprecatory, depreciative, depreciatory, slighting, depreciating

See also: critical, uncomplimentary