cold-blood·ed

[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

Related forms
cold-blood·ed·ly, adverb
cold-blood·ed·ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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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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00:10
Cold-blooded is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
the offspring of a zebra and a donkey.
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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
They are cold-blooded, so they use the sun to warm up their bodies.
In this kind of suspended animation, warm-blooded animals essentially turned
  into cold-blooded ones.
Many cold-blooded animals, and dragonflies are cold-blooded, have difficulty
  being active when the air temperatures are cold.
One aspect of these ancient societies and their languages is the almost
  cold-blooded torpidity with which change occurred.
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