1. superlative form of impolite; most rude or discourteous in manner or behavior
Usage: superlative degree of the adjective 'impolite'

Examples

• That was the impolitest comment I've ever heard from him.
• She gave the impolitest response by ignoring the question entirely.
• His impolitest behavior at dinner shocked everyone at the table.
• It would be impolitest to interrupt the speaker right now.
• The impolitest thing you can do is check your phone during a conversation.
• Among all the rude remarks, that was arguably the impolitest one.