Etymology
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inhumane (adj.)

originally a variant spelling and pronunciation of inhuman "cruel, hard-hearted;" it appears to have died out 17c. but returned c. 1822, probably a reformation as a negative of humane (q.v.), with its accent.

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Definitions of inhumane

inhumane (adj.)
lacking and reflecting lack of pity or compassion; "humans are innately inhumane; this explains much of the misery and suffering in the world";
biological weapons are considered too inhumane to be used
From wordnet.princeton.edu