Adjectives and nouns don't always have to "go together" as you said . So, you could say: "Perfect man" or " the man is perfect". They mean the same. You want to play with words? You could also say : perfect is the man, perfect are you By the way, there is a difference between "Perfect,.... sir" , and "Perfect sir". The second is unusual. Replace the "Sir" with a noun to make it more meaningful: perfect man, perfect teacher, perfect leader etc.