The word "un-seat" refers to the removal of someone or something from their position of authority or power. The antonyms for "un-seat" would be words that suggest gaining or securing power, rather than losing it. Therefore, some antonyms for "un-seat" could be words like "elect", "enthrone", "appoint", "anoint", "crown", and "invest". For example, a political candidate who wins an election could be said to "seat" themselves in office, while a monarch who ascends to the throne would be "crowned" or "enthroned". These words all suggest a positive change in status, unlike "un-seat", which suggests a negative or undesirable outcome.