cavalier
🇺🇸
/ˌkævəˈlɪr/
🇬🇧
/ˌkævəˈlɪə(r)/
Not showing enough concern about serious matters or other people's feelings.
He had a cavalier approach to following rules, often ignoring them completely.
Someone who supported the King during the English Civil War.
In history class, we learned how cavaliers fought against parliamentarians.