The adjective inhumane means cruel and heartless. Use it to describe terrible things like your neighbor's inhumane treatment of his hound dogs, which he leaves tied up in the yard in all kinds of weather.

Whenever someone acts without considering the discomfort or pain of another person or animal, you can describe their actions as inhumane. A cruel government that keeps prisoners in terrible conditions is inhumane, and the treatment of farm animals is in some cases revealed to be inhumane by investigators. The word inhumane was originally a synonym of inhuman, literally "not human," but it fell out of use and then was revived in the 1820s to mean the opposite of humane.

Definitions of inhumane
  1. adjective
    reflecting lack of pity or compassion
    “humans are innately inhumane
    “biological weapons are considered too inhumane to be used”
    barbarous, brutal, cruel, fell, roughshod, savage, vicious
    (of persons or their actions) able or disposed to inflict pain or suffering
    beastly, bestial, brutal, brute, brutish
    resembling a beast; showing lack of human sensibility
    marked by barbarity suggestive of a cannibal; rapaciously savage
    cold, cold-blooded, inhuman, insensate
    without compunction or human feeling
    pitiless, unkind
    deficient in humane and kindly feelings
    causing physical or psychological pain
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    marked or motivated by concern with the alleviation of suffering
    civilised, civilized
    having a high state of culture and development both social and technological
    showing or having compassion
    having human form or attributes as opposed to those of animals or divine beings
    designed to promote a child's personal qualities rather than to provide training or information
    human-centered, human-centred, humanist, humanistic, humanitarian
    marked by humanistic values and devotion to human welfare
    showing or giving mercy
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