1. extremely bad or unpleasant
2. extremely cruel or wicked

Examples

• The weather was atrocious during our camping trip.
• Her singing was so atrocious that people left the concert early.
• The dictator committed atrocious crimes against his own people.
• The food at that restaurant was absolutely atrocious.
• The atrocious conditions in the prison shocked the inspectors.
• His handwriting is atrocious – I can’t read a single word.
• The atrocious treatment of prisoners violated international law.