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Adjective: cold-blooded  'kówld'blú-did
  1. Without compunction or human feeling
    "cold-blooded killing";
    - cold, inhuman, insensate
  2. (zoology) having cold blood (in animals whose body temperature is not internally regulated)

See also: ectothermic, heterothermic, inhumane, poikilothermic, poikilothermous

Antonym: warm-blooded

Encyclopedia: Cold-blooded