"Rounded out" is a phrase used to describe the completion or fullness of something. There are several synonyms that can be used in its place to convey the same meaning. For example, "completed" denotes the finality and achieved state of something. Alternatively, "finished" also implies conclusion, but with a focus on the end of a process rather than a final product. "Thorough" highlights a sense of detail, exhaustiveness, and completeness. "Comprehensive" is another synonym that emphasizes thoroughness and completeness, often used in the context of research. Lastly, "well-rounded" describes something that is balanced and comprehensive, often applied to individuals with a diverse skillset or knowledge base.