- Having cold blood; -- said of fish or animals whose
blood is but little warmer than the water or air about them. - Deficient in sensibility or feeling; hard-hearted. - Not thoroughbred; -- said of animals, as horses,
which are derived from the common stock of a country.
Meaning of 'cold-blooded' (Princeton's WordNet)
1 . cold-blooded
[ s]
Meaning (1): - without compunction or human feeling