Motormouth, a term used to describe an excessively talkative person, goes hand in hand with its antonyms, which are the opposite of the talkative nature. Some antonyms for motormouth are reticent, silent, quiet, reserved, and shy. These terms describe people who are not so outgoing and tend to communicate less frequently than others. They listen more often, observe and think before speaking. Some individuals are naturally introverted, while others may prefer to remain quiet in specific situations such as business meetings, conferences or social gatherings. Thus, opposite to motormouth, various terms describe the reserved nature of some people.