atrocity
US /əˈtrɑː.sə.t̬i/
UK /əˈtrɑː.sə.t̬i/

1.
an extremely wicked or cruel act, typically one involving physical violence or injury
:
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The war was marked by numerous atrocities committed by both sides.
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The human rights organization documented the atrocities committed against civilians.
2.
a highly unpleasant or offensive thing
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The building was an architectural atrocity.
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His singing was an absolute atrocity.