The word "un-cleanest" suggests something that is not clean or dirty. Its antonyms include words like cleanest, neatest, spotless, pristine, and immaculate. Cleanest describes something that is free from dirt, while neatest is used to describe something that is orderly and well-groomed. Spotless, on the other hand, means that there are no stains or marks on a surface. Pristine refers to something that has been maintained in its original condition, and immaculate means something that is completely free from any flaws or defects. These antonyms are useful in describing environments and objects that are tidy and hygienic, giving them a positive and favorable connotation.