1. 无情的：cold-blooded 冷血的 | cold-hearted 无情的 | compassionate 富有同情心的

2. 冷淡的：cold-eyed 眼光冷淡的 | cold-hearted 冷淡的 | cold-heartedly 冷淡地

3. 冷酷無情：having the type of character or personality mentioned 有...性格(或品格)的 | cold-hearted 冷酷無情 | kind-hearted 好心腸

4. 冷淡的, 无情的：cold-blooded 冷血的, 冷酷的, 怕冷的 | cold-hearted 冷淡的; 无情的 | coldness 寒冷; 冷淡 (名)

1. 无同情心的;铁石心肠的
A cold-hearted person does not feel any affection or sympathy towards other people.

e.g. ...a cold-hearted killer.
铁石心肠的杀手