There are a multitude of synonyms for the phrase "are timeless." Some other ways to describe something as timeless include "enduring," "ageless," "classic," "evergreen," "time-honored," "perennial," "eternal," and "immortal." All of these words convey the same idea of something being enduring and retaining its relevance and value over time. They can be used to describe a wide range of things, from art and literature to fashion and design. No matter what specific word you choose to use, they all capture the essence of something that will never go out of style or lose its significance.