When describing something that has been divided into four parts or quarters, there are a number of synonyms that can be used instead of "most quartered". For example, the phrase "quartered into four equal parts" can be used to indicate that something has been divided evenly. Another option might be to say that something has been "partitioned" or "split into four sections". Alternatively, if the division is not exact, one might say that something has been "roughly quartered" or "approximately divided into four parts". Other possible phrasings might include "divided into quadrants" or "cut into quarters". Ultimately, the choice of synonym will depend on the context and the specific qualities of the thing being quartered.