When it comes to describing something thoroughly, "in detail" is a commonly-used phrase. However, there are several synonyms you can use to vary your language. Some options include "in-depth," "meticulously," "comprehensively," "thoroughly," "elaborately," "diligently," "rigorously," and "carefully." Each of these words can be used to convey the same level of analysis and attention to detail as "in detail." It's worth using different synonyms for "in detail" when writing in order to avoid repetition and keep your language diverse. By incorporating synonyms into your writing, you can elevate the impact of your message.