The word "overscale" implies that something is too large or exceeds the appropriate size or scale. Antonyms for this word, then, would include "underscale" or "undersized," suggesting that something is smaller than it should be or below the appropriate scale. Other antonyms might include "appropriate," "proportionate," "reasonable," or "fitting," all of which imply that something is the correct size or scale for its intended purpose. By considering the antonyms for "overscale," we can better understand the importance of finding the right size and scale for various objects, spaces, and situations.