Of persons: Not having the qualities proper or natural to a human being; esp. destitute of natural kindness or pity; brutal, unfeeling, cruel. Also…

Inhuman, inhumane, unmerciful, cruel. Of actions, etc.

Brutal, barbaric; inhuman.

Lacking human decency or compassion; brutally harsh or cruel; inhuman. Now rare.

= inhuman, adj. 1. Obsolete.

Inhumanly cruel or savage; brutal.

Characteristic of Phalaris; inhumane, merciless.

Inhuman, inhumane, unmerciful, cruel. Of persons.

Inhuman; coarsely cruel, savage, fierce.

= unmanly, adj. (in various senses).

One who practises or advocates the practice of brutality. Also as adj.

Not accepting, or disregarding, the views and practices of humanitarianism.