cold-blooded

[kohld-bluhd-id]
adjective
1.
designating or pertaining to animals, as fishes and reptiles, whose blood temperature ranges from the freezing point upward, in accordance with the temperature of the surrounding medium; poikilothermic.
2.
without emotion or feeling; dispassionate; cruel: a cold-blooded murder.
3.
sensitive to cold.

Origin:
1585–95

cold-bloodedly, adverb
cold-bloodedness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
cold-blooded
 
adj
1.  having or showing a lack of feeling or pity: a cold-blooded killing
2.  informal particularly sensitive to cold
3.  poikilothermic (of all animals except birds and mammals) having a body temperature that varies with that of the surroundings
 
cold-'bloodedly
 
adv
 
cold-'bloodedness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

cold blooded
also cold-blooded; 1590s, of persons, "without emotion, unfeeling;" of actions, from 1828. The phrase refers to old notion that blood temperature rose with excitement. In the literal sense, of reptiles, etc., from c.1600.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

cold-blooded adj.
Ectothermic.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
cold-blooded   (kōld'blŭd'ĭd)  Pronunciation Key 
Having a body temperature that changes according to the temperature of the surroundings. Fish, amphibians, and reptiles are cold-blooded.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Snakes are cold blooded, and as such don't eat much.
We had already come to realize that not all dinosaurs were cold blooded.
Such cold blooded and sinful genocide of the unborn cannot be allowed to go
  unchallenged.
The disagreements among us are conducted in a cold blooded, precise and logical
  manner.
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