The word "in sides" refers to the interior or inner parts of something. Antonyms for this term would be words that describe the outside or exterior of something. Such antonyms include "outside," "exterior," "external," "surface," "peripheral," and "superficial." These words describe things that are visible, apparent, or accessible from the outer part of something. They are used to contrast with "in sides," which refers to things that are hidden, enclosed, or deep within something. Understanding the antonyms for "in sides" can help in describing the entirety of something, both its internal and external aspects.