Concavities are indentations or depressions in a surface. There are a variety of synonyms for this word, including hollows, cavities, indentations, depressions, bowls, dents, troughs, craters, dimples, and pits. Each synonym brings a slightly different connotation to the meaning of concavities. For instance, hollows and cavities suggest a deeper, more enclosed space, while dents and dimples imply a shallower, less severe impact. No matter which word you choose to describe concavities, they all convey the general idea of a depression in a surface. Understanding the synonyms of concavities can help you choose the word that best suits your needs in describing this phenomenon.