Cavalier /(kăv`ȧ*lēr")/

Cav·a·lier

Cavalier

n.
  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.)

Cavalier

a.
  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.