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Adjective: admonitory  ad'mó-nu,to-ree [N. Amer], ad'mó-ni-tu-ree [Brit]
  1. Serving to warn
    "an admonitory jail sentence";
    - cautionary, exemplary, monitory, warning
     
  2. Expressing reproof or reproach especially as a corrective
    "The teacher gave an admonitory look to the disruptive student";
    - admonishing, reproachful, reproving

See also: dissuasive, unfavorable [US], unfavourable [Brit, Cdn]