1. The political and social principles or practices of the Cavaliers, especially those who supported King Charles I during the English Civil War.
Usage: historical; often capitalized when referring to the 17th-century movement
2. An attitude or manner characterized by dismissiveness, arrogance, or lack of concern for others' feelings or rights.
Usage: modern usage; often pejorative

Examples

• The historian studied cavalierism to understand the royalist faction during the English Civil War.
• His cavalierism toward the concerns of his employees made him an unpopular manager.
• The king's cavalierism in dismissing Parliament angered many nobles.
• She criticized his cavalierism about the environmental crisis.
• Cavalierism as a political movement declined after the Restoration.
• The diplomat's cavalierism offended the visiting delegation.