cold-blooded
/-ˈblʌdɪd; -`blʌdɪd/ adj
1 (biology 生) having a blood temperature which varies with the temperature of the surroundings 冷血的（血液温度随环境温度的高低而改变的）
Reptiles are cold-blooded. 爬行动物是冷血的.
2 (derog 贬) (of people or actions) without pity; cruel （指人或行动）无情的, 残酷的
a cold-blooded murderer, murder 残忍的谋杀者、 谋杀.