Inhuman (adjective)

1. Cruel, brutal, or lacking pity or compassion.
2. Not characteristic of or suitable for human beings; cruel and oppressive.

Origin:

Late middle english: from latin inhumanus, from in- 'not' + humanus 'human'.

Examples:

1. The inhuman conditions in the prison were a violation of human rights.
2. The inhuman treatment of the prisoners shocked the world.
3. The inhuman slaughter of innocent civilians was condemned by the international community.
4. The inhuman tactics used by the army during the war were a stain on its reputation.
5. The inhuman acts of the dictator were well documented and widely known.