The phrase "in apple pie order" means neat, tidy and well-organized. The antonyms for this phrase could be "chaotic", "disorganized", "messy", "untidy", "cluttered" or "haphazard". If something is not in apple pie order, it could imply that it is difficult to find what you're looking for or that it's frustrating to work with. For example, a disorganized bookshelf can make it challenging to locate the book you want to read. A chaotic workspace can negatively affect productivity and make it challenging to accomplish tasks. In short, being in apple pie order is essential when one wishes to maintain order, discipline, and efficiency in their work or life.