The deltoid muscle is a large triangular muscle located on the shoulder. It is responsible for the movement of the arm, rotation, and stability. There are many words that can be used to describe a well-developed deltoid muscle. Synonyms for the word "more deltoid" include broader shoulders, toned arms, muscular deltoids, defined shoulders, and well-rounded arms. These words can be used to describe the appearance of the shoulders and the muscular structure of the deltoids. Regular exercises such as shoulder presses, lateral raises and front raises can help in building and strengthening the deltoid muscles.