Put simply, antonyms for the phrase "putting nutshell" include expanding, elaborating, and explaining in great detail. While summing up complex ideas in a concise manner is a valuable skill, it is not always appropriate or effective. Sometimes, a more detailed explanation is necessary to convey the full complexity and nuance of a concept. Antonyms to "putting nutshell" can also include complicating, perplexing, and making things difficult to understand. These actions might involve adding too much detail, using complex language, or introducing unnecessary information that detracts from the main point. In summary, while putting things in a nutshell can be useful, it is not always the best approach to communication.