The antonyms for the word "outgoingest" are words that convey an opposite meaning to the adjective. Therefore, words such as introverted, withdrawn, bashful, and shy can be considered antonyms of outgoingest. These words describe individuals who prefer to stay in their comfort zone, avoid social interactions, and may find it challenging to speak up or share their thoughts with others. While an outgoingest person tends to be sociable, confident, and extroverted, an introverted person may be more reserved, contemplative, and reflective. It's important to note that personality traits fall on a spectrum, and individuals may exhibit aspects of both outgoingest and introverted qualities.