We found one dictionary that defines the word showing bad manners:

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1. showing bad manners: Rhymezone

Definitions from WordNet (showing bad manners) ▸ adverb:  in an impolite manner Opposite: polite, courteous, well-mannered, respectful ▸ Words similar to showing bad manners ▸ Usage examples for showing bad manners ▸ Idioms related to showing bad manners ▸ Wikipedia articles (New!) ▸ Words that often appear near showing bad manners ▸ Rhymes of showing bad manners ▸ Invented words related to showing bad manners