Source : Webster's Revised Unabridged Dictionary (1913)

Desperado \Des`per*a"do\, n.; pl. {Desperadoes}. [OSp.
   desperado, p. p. of desperar, fr. L. desperare. See
   {Desperate}.]
   A reckless, furious man; a person urged by furious passions,
   and regardless of consequence; a wild ruffian.

Source : WordNet®

desperado
     n : a bold outlaw (especially on the American frontier) [syn: {desperate
         criminal}]
     [also: {desperadoes} (pl)]