Skin and bones refer to someone who is very thin or emaciated. However, there are plenty of antonyms to this phrase, which describe people or things that have a more substantial build, size, or quantity. Some of these antonyms include the words, plump, chubby, hefty, fat, curvy, hefty, and bulky, among others. These words describe people with more meat on their bones, and they don't look the same as those who are skinny. When you compare these antonyms, you realize that they are mostly used to describe women or men who are considered to be overweight. Therefore, it's important to approach these words with sensitivity and avoid body shaming people who have a different build than your own.