adjective
Definition: Showing a lack of concern or care; dismissive and often arrogant in attitude.
Example: His cavalier approach to the project led to many mistakes and oversights.
noun
Definition: A man who is brave and shows good manners, often serving as an escort to a woman of high social status; also refers to a knight or mounted soldier.
Example: The cavalier rode proudly into the tournament, ready to compete for the favor of the princess.