cold-blooded

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cold-blooded:

see body temperaturebody temperature,
internal temperature of a living organism. Mammals and birds are termed warm-blooded, or homeothermic, i.e., they are able to maintain a relatively constant inner body temperature, whereas other animals are cold-blooded, or poikilothermic, i.e.
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cold-blooded

[′kōld ¦bləd·əd]
(physiology)
Having body temperature approximating that of the environment and not internally regulated.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

cold-blooded

(of all animals except birds and mammals) having a body temperature that varies with that of the surroundings
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
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A world used to violence in this age of terrorism still cringed at the news of the daily killings, either by police or vigilantes, of suspected drug "personalities." Despite the same things having already happened in other countries, like Colombia and Thailand, the world at large still was shocked by the brutality and cold-bloodedness of the EJKs in the Philippines.
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Obfuscated, however, is any hint at the just cause of the rebels or the tremendous losses they had already sustained by this point in the long-running conflict, which the British had inflicted with racist cold-bloodedness. Bombastic though it is, this painting is markedly different from the gloating and bloody scenes of vanquished and decimated enemies with which French artists such as Antoine-Jean Gros or Anne-Louis Girodet de Roussy-Trioson depicted the Napoleonic invasion of Egypt.
They appeal for cold-bloodedness and announce that in the next period there will be other forms of pressing interethnic and interreligious conflicts.
The leading function of the monarch is related to his brightness: he must shine above all by virtue, wisdom, kindness, justice, understanding, cold-bloodedness, and to rule by the example of his virtues.
"Despite the government's policies, the Alawites in Syria have acted with cold-bloodedness and rationality.