1. 缺乏热情的：impassion 激动 | impassive 缺乏热情的 | impatience 急躁

2. 冷漠的：impassioned 热烈的 | impassive 冷漠的 | impassively 无感情地

3. 冷漠的,无表情的：immoral 不道德的 | impassive 冷漠的,無表情的 | impure 不純的

4. 无动于衷的,冷漠的：massive 大而重的,魁伟的;大规模的,大量的 | impassive 无动于衷的,冷漠的 | recessive 隐性遗传的,后退的

1. 喜怒不形于色的;不露感情的;面无表情的
If someone is impassive or their face is impassive, they are not showing any emotion.

e.g. He searched Hill's impassive face for some indication that he understood...
他盯着希尔毫无表情的面孔，寻找着表明他已明白的些许迹象。
e.g. As the foreman of the jury announced the verdict, Miss Allan remained impassive.
陪审团主席宣布裁决时,艾伦小姐一直面无表情。