Up-start is a word that refers to a person who has recently risen to a position of power or prominence. The opposite of up-start are words that describe people who are established, experienced, or seasoned in their fields. These antonyms include words like veteran, expert, authority, master, professional, and specialist. People who are labeled as up-starts are often seen as inexperienced or naive, while those who are considered veterans or experts are seen as reliable and trustworthy. Using antonyms for up-start can provide a full picture of someone's skills, knowledge, and experience, and it can help to avoid misjudging a person based on prejudices or stereotypes.