Reaffirm is a verb that means to state again or to confirm the validity of something previously stated. There are several synonyms for the word reaffirm that can be used interchangeably depending on the context in which the word is being used. Some of the most common synonyms for reaffirm include reassert, confirm, validate, ratify, endorse, approve, verify, substantiate, and bolster. Each of these synonyms has its own unique nuance, but they all communicate the idea of restating or confirming something that has already been said or established. Using synonyms for reaffirm can help to add variety and depth to written or spoken communication.