Inhuman

google

ref

late Middle English (originally as inhumane ): from Latin inhumanus, from in- ‘not’ + humanus (see human).

wiktionary

ref

in- +‎  human

etymonline

ref

inhuman (adj.)

mid-15c., "cruel," from Latin inhumanus "inhuman, savage, cruel, rude, barbarous, uncultured," from in- "not, opposite of" (see in- (1)) + humanus "human" (see human (adj.)). Spelled inhumane till 18c. (see humane).