Most unbidden is a phrase that refers to something that happens unexpectedly or without prior invitation. Antonyms for this phrase could include "expected," "anticipated," "invited," "planned," "welcomed," "requested," or "prearranged." When something is "expected," it means that it is not surprising or unforeseen. Anticipated implies that someone is waiting for something to happen, while invited means that someone is intentionally asked to join or participate. Something that is "welcomed" is received with open arms, while "requested" means that someone has specifically asked for it. Lastly, "prearranged" means that something has been planned in advance. These antonyms may be helpful in describing a situation where something is not unexpected or unwelcome.