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Lout
Negative Connotation
The word 'lout' often implies disapproval and is used to express a strong negative opinion about someone's behavior. 
Gender Specific
While 'lout' typically refers to men, it can be used for any gender when stressing clumsy rudeness. 
Casual Context
Use 'lout' in casual or informal contexts; it might not be suitable for formal writing or speech. 