n.无情；残忍；冷酷
Oh, yes, he had a streak of ruthlessness that rivaled Peter's, but he had the decency to be appalled by his own brutality. 哦，是的，他有着可与彼得抗争的冷酷无情的气息，但是他正派得会为自己的残忍而骇怕。
Ruthlessness is the kindness of the wise. 冷酷是智者的仁慈。
She doesn't have the ruthlessness required to succeed in business. 要在生意场上干出一番名堂，她缺乏必要的冷酷心肠。
