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Adjective: coldhearted  'kówld'haa(r)-tid
  1. Lacking in sympathy or feeling
    "Turned on by the heroine's turnoff, the coldhearted hero then proceeds to use that superior knowledge to romantically pursue the heroine"
Adverb: cold-heartedly  'kówld'haa(r)-tid-lee
  1. In a cold-hearted manner
    "He cold-heartedly rejected her plea for help"

See also: brittle, unloving

Antonym: warmhearted