1. showing a lack of proper concern; dismissive or careless

1. a horseman or knight, especially a courtly gentleman
Usage: historical
2. a supporter of King Charles I in the English Civil War
Usage: historical

Examples

• His cavalier attitude toward safety regulations worried his coworkers.
• She gave a cavalier response to the serious accusations.
• The manager’s cavalier dismissal of employee concerns caused resentment.
• The cavalier rode through the countryside on his noble steed.
• Medieval cavaliers were expected to follow the code of chivalry.
• The Cavaliers fought against Parliament during the English Civil War.
• He treated the important meeting with cavalier indifference.