1. cruel, savage, or inhuman behavior
2. extremely unpleasant or disgusting quality

Examples

• The beastliness of the dictator’s regime shocked the world.
• She was appalled by the beastliness of his treatment of animals.
• The beastliness of the weather ruined our picnic plans.
• His beastliness toward his employees made him widely disliked.
• The novel depicted the beastliness of war in graphic detail.
• The beastliness of the living conditions was unbearable.