There are a number of synonyms for the word "incy," which is a shortened form of "incidentally." Some of the most common synonyms include "by the way," "in passing," "casually," "in passing," and "as an aside." Other options might include "in passing," "en passant," or "coincidentally." Depending on the context in which the word is being used, other synonyms might be more appropriate. For example, if it is being used to introduce a new topic, "speaking of which" or "on another topic" might be more appropriate. Regardless of the synonym used, it is important to ensure that the intended meaning of the original word remains clear.