a bandit, outlaw, desperado, etc., especially in the early history of the western U.S.
Other definitions for bad man (2 of 2)
(sometimes initial capital letters) the devil.
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British Dictionary definitions for badman
mainly US a hired gunman, outlaw, or criminal
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012