Cavalier

–noun
1.a horseman, esp. a mounted soldier; knight.
2.one having the spirit or bearing of a knight; a courtly gentleman; gallant.
3.a man escorting a woman or acting as her partner in dancing.
4.(initial capital letter) an adherent of Charles I of England in his contest with Parliament.

–adjective
5.haughty, disdainful, or supercilious: an arrogant and cavalier attitude toward others.
6.offhand or unceremonious: The very dignified officials were confused by his cavalier manner.
7.(initial capital letter) of or pertaining to the Cavaliers.
8.(initial capital letter) of, pertaining to, or characteristic of the Cavalier poets or their work.

–verb (used without object)
9.to play the cavalier.
10.to be haughty or domineering.