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Adjective: deprecatory  'de-pru-ku,to-ree [N. Amer], de-pru-ku-t(o-)ree [Brit]
  1. Tending to diminish or disparage
    "deprecatory remarks about the book";
    - belittling, deprecating, deprecative, depreciative, depreciatory, slighting, depreciating

See also: uncomplimentary