Source : Webster's Revised Unabridged Dictionary (1913)

Swashbuckler \Swash"buc`kler\, n.
   A bully or braggadocio; a swaggering, boastful fellow; a
   swaggerer. --Milton.

Source : WordNet®

swashbuckler
     n : a reckless impetuous irresponsible person [syn: {daredevil},
          {madcap}, {hothead}, {lunatic}, {harum-scarum}]