The English language is rich and varied, and there are many synonyms available for the phrase "unimportant details." Some options include minutiae, trivialities, trifles, particulars, and nuances. Other synonyms for this phrase might include secondary details, minor points, or inconsequential facts. No matter what word you choose to use, the meaning remains the same: these are details that are not essential to the central message or argument. While such details may add color or texture to a narrative, they are ultimately less important than the larger themes or ideas being conveyed. By keeping this in mind, writers can make sure their writing remains focused and impactful.