Dingier is a word that describes something that is unclean, dirty, or shabby in appearance. However, there are several synonyms that could be used to replace this term, depending on the context of the sentence. These include drab, seedy, grimy, squalid, grungy, and murky. Each of these words has a slightly different connotation, but they all signify a state of disrepair or filth. For example, drab is often used to describe something that is dull or uninspiring, while seedy is often used to describe a place that is associated with crime or vice. Utilizing these synonyms can help add variety and nuance to one's writing while accurately conveying the intended meaning.