Cold-blooded

Webster's Dictionary of the English Language

·adj Deficient in sensibility or feeling; hard-hearted.

II. Cold-blooded ·adj Not thoroughbred;

— said of animals, as horses, which are derived from the common stock of a country.

III. Cold-blooded ·adj Having cold blood;

— said of fish or animals whose blood is but little warmer than the water or air about them.