Definition of foul-mouthed adjective from the Oxford Advanced American Dictionary

 

foul-mouthed

 adjective
adjective
NAmE//ˈfaʊl maʊðd//
 
, NAmE//ˈfaʊlmaʊθt//
 
 
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using rude, offensive language a foul-mouthed racist
See the Oxford Advanced Learner's Dictionary entry: foul-mouthed