The term 'Impudent One' can be described by three crossword solutions: BRAT (4 letters), SASSER (6 letters), and SNIP (4 letters). BRAT is a slang term for a mischievous child who behaves badly and disrespectfully. SASSER is an informal term for someone who speaks in a disrespectful or insolent manner. SNIP is an informal term for someone who speaks sharply or rudely. All three terms refer to someone who is impudent, or lacking respect for authority.