Definition of blackguard noun from the Oxford Advanced American Dictionary

 

blackguard

 noun
noun
NAmE//ˈblæɡərd//
 
, NAmE//ˈblæɡɑrd//
 
(old-fashioned)
 
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a man who is dishonest and has no sense of what is right and what is wrong
See the Oxford Advanced Learner's Dictionary entry: blackguard