Any old way refers to a carefree, haphazard approach to doing something without considering the consequences. Antonyms for any old way might include words like methodical, systematic, or deliberate. They imply a more thoughtful, careful approach to a task or problem. Another antonym could be structured or organized, meaning that there is a clear plan or process in place. Intentional might also be an antonym, indicating a purposeful and goal-oriented approach to achieving an outcome. These antonyms stand in contrast to any old way, suggesting that taking a more considered approach can lead to better results and a more satisfying outcome.