The phrase "of mark" is often used to describe something that is significant or noteworthy. However, there are many other synonyms that can be used to convey similar meanings. Some examples include "notable," "remarkable," "impressive," "distinguished," "prominent," "renowned," and "memorable." Each of these words carries its own unique connotations and can be used in different contexts to denote different levels of significance. Whether you are describing a person, place, or thing, there are many different ways to express its importance and make it stand out as something truly special.