"On the outside" refers to the external or visible appearance of something or someone. There are various synonyms for this phrase, such as superficially, outwardly, externally, or visibly. These terms all describe the external features of something, without getting into the details or the deeper, underlying aspects. Other synonyms for "on the outside" include apparent, exteriorly, surface-level, and perceptibly. These words can be used interchangeably in various contexts, such as describing how something appears without addressing the underlying truth or essence of what is being observed. Overall, there are many different words that can be used to describe the external appearance of something or someone, which can help to add depth and nuance to our descriptions.