
unmenschlich
inhuman
Extremely cruel, brutal, or without compassion; violating basic human dignity.
Die Gefangenen wurden unter unmenschlichen Bedingungen gehalten.
The prisoners were held under inhuman conditions.
inhuman / extreme
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inhuman
Extremely cruel, brutal, or without compassion; violating basic human dignity.
Die Gefangenen wurden unter unmenschlichen Bedingungen gehalten.
The prisoners were held under inhuman conditions.

extreme
Reaching an extreme degree that goes beyond normal human limits. Can be used as an intensifier for effort, heat, pressure, etc.
Bei der Prüfung stand er unter einem unmenschlichen Druck.
During the exam, he was under extreme pressure.
The word consists of the prefix 'un-' and the adjective 'menschlich' (human). The prefix 'un-' negates the base word and here means 'not human' in the sense of cruel or extreme.
Seine Gleichgültigkeit gegenüber dem Leid anderer war einfach unmenschlich.
His indifference to the suffering of others was simply inhuman.
In the meaning 'grausam' (cruel), 'unmenschlich' (inhuman) is often used to describe actions or conditions. Typical combinations are 'unmenschliche Behandlung' (inhuman treatment), 'unmenschliches Verhalten' (inhuman behavior), or 'unmenschliche Lebensbedingungen' (inhuman living conditions).
Die Berichte über die unmenschliche Behandlung der Flüchtlinge schockierten die Welt.
The reports about the inhuman treatment of the refugees shocked the world.
When 'unmenschlich' (extreme) serves as an intensifier, it usually comes before abstract nouns that describe a degree or extent. Pay attention to words like 'Druck' (pressure), 'Anstrengung' (effort), 'Hitze' (heat), or 'Lärm' (noise) to distinguish this meaning from the moral meaning 'grausam' (cruel).
Die Athleten mussten eine unmenschliche Anstrengung leisten, um das Ziel zu erreichen.
The athletes had to make an extreme effort to reach the finish line.
inhuman
Unmenschlich and menschenverachtend both describe behavior that causes serious harm. Unmenschlich emphasizes extreme cruelty or a lack of compassion. Menschenverachtend is especially appropriate when an attitude, statement, or action explicitly shows that the dignity and value of human beings are held in low regard.

Die unmenschliche Behandlung der Gefangenen ließ ihnen trotz Krankheit weder Ruhe noch Hilfe.
The inhumane treatment of the prisoners gave them neither rest nor help despite their illness.
Die Aussage, die Gefangenen seien wertlos und hätten keine Rechte, war menschenverachtend.
The statement that the prisoners were worthless and had no rights was contemptuous of human dignity.