The word "untidying" refers to the act of making something messy, disorderly or untidy. In contrast, its antonyms are words that describe the opposite actions - making something neat, tidy, organized and clean. Some of the antonyms for untidying include tidying up, organizing, sorting out, arranging, straightening, and cleaning. The act of tidying up generally means putting things in order and getting rid of anything unnecessary or cluttering. For instance, you can tidy up your room by making the bed, dusting the furniture, and packing away any clothes or items that are out of place. Overall, untidying's antonyms aim to create order and structure in the environment.