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Adjective: inclement  in'kle-munt or in-klu-munt [N. Amer], in'kle-munt [Brit]
  1. (of weather or climate) severe
    "The hikers were caught in inclement weather and had to seek shelter"
     
  2. Used of persons or behaviour; showing no clemency or mercy
    "the harsh sentence of an inclement judge"

See also: intemperate, merciless, unmerciful, unsparing

Antonym: clement