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Adverb: unreasonably  ,ún'ree-zu-nu-blee
  1. Not in a reasonable or intelligent manner
    "she reacted unreasonably when she learned she had failed"
  2. To a degree that exceeds the bounds of reason or moderation
    "his prices are unreasonably high";
    - immoderately, unconscionably

Antonym: moderately, sensibly