1. extremely bad or poor in quality
Usage: informal
2. resembling or suggesting an abyss; immeasurably deep
Usage: literary

Examples

• The team’s performance this season has been abysmal.
• Her test scores were abysmal despite weeks of studying.
• The restaurant received abysmal reviews from food critics.
• The movie was an abysmal failure at the box office.
• He stared into the abysmal depths of the canyon.
• The abysmal darkness of the cave frightened the explorers.