The word "most umbilicated" is used to describe something that has a sunken or depressed center, resembling the shape of a belly button or navel. Synonyms for this word include "concave," "indented," "depressed," "sunken," or "hollowed." Other similar words that can be used to describe something with a similar shape include "cupped," "dished," "incurvate," "scalloped," or "resaccate." Regardless of the specific word used, these adjectives all describe something with a distinctive shape that adds depth and texture to its appearance. These types of textured surfaces can be found in a variety of natural and manmade objects, including seashells, craters, and dimples on skin.