For example, “She has a big blue book” can be said as “She has a big and blue book”, so you cannot use a hyphen between “big” and “blue.” As a counter example, "He is a world-famous singer" cannot be said as "He is a world and famous singer", so you should join the words with a hyphen.
I am writing the sentence above, but cannot come up with an appropriate expression to alternatively use in the place of the bold-faced one. I googled the expression as a counter example, but I think this expression is maybe so uncommon that little articles used such an expression. Can anyone recommend some expressions that I can use instead of that?