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Adjective: uncomplimentary  ,ún,kóm-pli'men-t(u-)ree
  1. Showing or representing unfavourably
    "an uncomplimentary dress";
    - unflattering
     
  2. Tending to (or intended to) detract or disparage
    "His uncomplimentary remarks about the performance upset the actors"

See also: belittling, deprecating, deprecative, deprecatory, depreciating, depreciative, depreciatory, derogative, derogatory, dislogistic, disparaging, dyslogistic, pejorative, slighting, sneering, snide, supercilious, unfavorable [US], unfavourable [Brit, Cdn]

Antonym: complimentary, flattering