Adjective

1. Easy; offhand; frank.

   The very dignified officials were confused by his cavalier manner.

2. High-spirited.
3. Supercilious; haughty; disdainful; curt; brusque.
4. Of or pertaining to the party of King Charles I.

Noun

1. A military man serving on horse.
2. A sprightly, military man; hence, a gallant.
3. One of the court party in the time of King Charles I, as contrasted with a Roundhead or an adherent of Parliament.
4. A work of more than ordinary height, rising from the level ground of a bastion, etc., and overlooking surrounding parts.
5. A well mannered man; a gentleman.