The word "outgoinger" doesn't have an established antonym as it is a non-standard word. However, if we consider the opposite of outgoing, we can say someone is introverted or shy. Therefore, the antonyms of an outgoing person would be reserved, timid, or reticent. These individuals feel uncomfortable or uneasy in social settings and usually prefer to spend time alone or in small groups. An outgoing person, on the other hand, is sociable, friendly, and confident, and loves to interact with people. While being outgoing might be advantageous in some situations, being introverted has its own benefits that shouldn't be overlooked.