"Characterized by" is a phrase that is commonly used to describe a certain quality or feature that defines something. However, there are various other synonyms that can be used in place of this phrase to add more variety and flavor to one's writing. These substitutes include "marked by", "defined by", "distinguished by", "typified by", "exemplified by", and "identified by". Each of these alternatives conveys a slightly different nuance of meaning, and their use depends on the context and tone of the sentence. By expanding one's vocabulary and exploring the many synonyms available, one can add depth and richness to their writing.