The opposite of "more dirtless" is "more dirty." The word "dirty" is an adjective that describes something that is covered in dirt, soil, or smudges. If something is "more dirty," it means it is even dirtier than it was before. This can refer to clothing, dishes, floors, or anything else that can become soiled. To keep things clean and hygienic, it's important to regularly clean and remove any dirt or grime. On the other hand, "more dirtless" refers to the quality of being relatively clean or free from dirt. It's a positive attribute that can be achieved through cleaning and maintaining a tidy environment.