Antonyms for the word virtuosities would include words like ineptitude, incompetence, clumsiness, and awkwardness. These words describe the opposite of virtuosities, which are skills, talents, and expertise. Ineptitude implies a lack of natural ability or aptitude, while incompetence suggests a lack of training or knowledge. Clumsiness refers to a lack of coordination or gracefulness, while awkwardness describes an uncomfortable or ungainly manner. These antonyms highlight the importance of practice and dedication in developing virtuosities, as well as the challenges that arise when such skills are lacking.