Frightful, evil, cruel, or monstrous.
Prisons have been the sites of atrocious mistreatment of prisoners.
Offensive or heinous.
I had resolved in my own mind, that to create another like the fiend I had first made would be an act of the basest and most atrocious selfishness; and I banished from my mind every thought that could lead to a different conclusion.
Very bad; abominable, disgusting.
Their taste in clothes is just atrocious.
From Latin atrōx (“cruel, fierce, frightful”) + -ious.
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