cav·a·lier 
/ˌkævəˈliɚ/ adjective
/ˌkævəˈliɚ/ adjective [more cavalier; most cavalier] disapproving : having or showing no concern for something that is important or serious
▪ They are too cavalier in their treatment of others. ▪ The writer is very cavalier [=careless] about the truth. ▪ She has a cavalier attitude about/towards spending money. ▪ He has a cavalier disregard for the rights of others.
▪ They are too cavalier in their treatment of others. ▪ The writer is very cavalier [=careless] about the truth. ▪ She has a cavalier attitude about/towards spending money. ▪ He has a cavalier disregard for the rights of others.
— cav·a·lier·ly adverb
▪ He cavalierly disregarded their advice.
▪ He cavalierly disregarded their advice.
