The term 'less well-behaved' can be summarized by two crossword solutions: 'naughtier' (9 letters) and 'ROWDIER' (7 letters). Naughtier is an adjective that describes someone who is mischievous or disobedient, while ROWDIER is an adjective that describes someone who is boisterous or unruly. Both words imply a lack of good behavior, suggesting that the person in question is not behaving in an appropriate manner.