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; poikilothermal.

without emotion or feeling; dispassionate; cruel

a cold-blooded murder.

sensitive to cold.

adjective

compassionate , demonstrative , feeling , friendly , merciful , nice , sympathetic , warm-blooded

adjective

barbarous , brutal , callous , cold , dispassionate , hard-boiled , hardened , hard-hearted , imperturbable , inhuman , matter-of-fact , merciless , obdurate , pitiless , relentless , ruthless , savage , steely , stony-hearted , uncompassionate , unemotional , unfeeling , unmovednotes:cold-blooded (poikilothermic , poikilothermal) is used for creatures whose blood takes on the temperature of their environment; warm-blooded (homoiothermic , homeothermal) is having a fairly steady body temperature governed by the thermotaxic nerve mechanism , cold-hearted , compassionless , hard , hardhearted , heartless , stonyhearted , emotionless , unaffected , unmoved , cruel , deliberate , diabolical , evil , insensitive , poikilothermal , poikilothermic , satanic