des·per·a·do 
(dĕs′pə-rädō, -rā-)
(dĕs′pə-rädō, -rā-)n. pl. des·per·a·does or des·per·a·dos
A bold or desperate outlaw, especially of the American frontier.
[Probably from Spanish desperado, desesperado, desperate person, from past participle of desesperar, to despair, from Latin dēspērāre; see DESPAIR.]