The crossword solution for the term 'Primitively Simple' is 'RUDE, ' which is a four-letter word. RUDE is defined as being impolite, disrespectful, or offensive in behavior or language. It is often used to describe someone who is not showing proper respect or consideration for others. Primitively Simple is a phrase that implies something is basic and uncomplicated, but also has a negative connotation due to its association with rudeness.