If you describe treatment or an action as inhuman, you mean that it is extremely cruel.
The detainees are often held in cruel and inhuman conditions.
被拘留者经常被羁押在既残酷又不人道的环境里。
If you describe someone or something as inhuman, you mean that they are strange or bad because they do not seem human in some way.
inhuman screams and moans.
异常恐怖的尖叫和呻吟。