Dirtless, a word used to describe something that is free from dirt, can have many antonyms depending on the context of the sentence. For example, the antonym for dirtless when describing a floor may be dirty or grimy. In the context of clothing, the opposite of dirtless may be stained or soiled. For a car, the antonym could be muddy or filthy. In general, the antonyms for dirtless are any words that describe the presence of dirt, dust, grime, or soil on an object or surface. To summarize, the antonyms for dirtless can vary depending on the item being described and its condition.