The term 'Rude Sort' can be broken down into two crossword solutions: CHURL (5 letters) and LEERER (6 letters). CHURL is an archaic term for a rude, surly, or bad-tempered person. It is derived from the Middle English word 'churle, ' which was used to describe a peasant or serf. LEERER, on the other hand, is a person who looks at someone with a sly, mocking, or lecherous expression. It is derived from the Middle English word 'leren, ' which means to look or stare. Both words are used to describe people who are rude or disrespectful in their behavior.