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Adverb: unfavorably  ,ún'fey-v(u-)ru-blee
Usage: US (elsewhere: unfavourably)
  1. Showing disapproval; in a disparaging way
    "he reviewed the play unfavorably";
    - unfavourably [Brit, Cdn]

See also: inauspiciously, unpropitiously

Antonym: favorably [US]