The term 'most impertinent' is an adjective used to describe someone or something that is rude, disrespectful, and overly bold. The three crossword solutions for this term are SAUCIEST (8 letters), brashest (8 letters), and sassiest (8 letters). SAUCIEST means having a bold and spicy flavor, while brashest implies being impudent and lacking in respect. Lastly, sassiest implies being cheeky and having a lot of attitude. All three words can be used to describe someone or something that is most impertinent.