Scaleless refers to something that lacks scales, such as a fish or reptile. There are many words that can be used as synonyms for this term. Some of these include sleek, smooth, unadorned, featureless, and unembellished. Other words that can be used to describe something that is scaleless are bare, naked, unvarnished, unornamented, and austere. Additionally, bald, plain, unmarked, uncarved, blank, and unprinted can all be used to describe something without scales or other markings. Whatever word you choose to use, it is important to ensure that it accurately reflects the characteristics of the object being described.