Cavalier — Defs

01 n. A military man serving on horseback; a knight.

1.
A military man serving on horseback; a knight.
2.
A gay, 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.(Fort.)

02 a. offhand; unceremonious; gay; easy; frank. Opposed to serious.

1.
offhand; unceremonious; gay; easy; frank. Opposed to serious.
“The plodding, persevering scupulous accuracy of the one, and the easy, cavalier, verbal fluency of the other, form a complete contrast.” — Hazlitt.
2.
High-spirited.[Obs.]
3.
Supercilious; haughty; disdainful; curt; brusque.
4.
Of or pertaining to the party of King Charles I.