cavalier

Short definition from Wiktionary

Adjective

1. 1
   Lacking the proper care or concern for something important, reckless, rash, high-handed.
2. 2
   High-spirited.
3. 3
   Supercilious.
4. 4
   Free and easy; unconcerned with formalities
5. 5
   Of or pertaining to the party of King Charles I of England (1600–1649).

Noun

1. 1
   A military man serving on horse, (chiefly) early modern cavalry officers who had abandoned the heavy armor of medieval knights.
2. 2
   A gallant: a sprightly young dashing military man.
3. 3
   A gentleman of the class of such officers, particularly
4. 4
   A gentleman of the class of such officers: A courtesan or noble under Charles I of England, particularly a royalist partisan during the English Civil War which ended his reign.
5. 5
   Someone with an uncircumcised penis.
6. 6
   A defensive work rising from a bastion, etc., and overlooking the surrounding area.
7. 7
   A Cavalier King Charles Spaniel.
8. 8
   A Chevrolet Cavalier.

Verb

1. 1
   Of a man: to act in a gallant and dashing manner toward (women).

Proper noun

1. 1
   A small city, the county seat of Pembina County, North Dakota, United States.