The antonyms for un-sanctioned are authorized, approved, sanctioned, legitimate, legal, and permitted. Authorized refers to having official permission or approval to do something. Approved implies that a person or an action has been formally declared to be acceptable, valid, or admirable. Sanctioned means recognized or approved by an authority, organization, or the law. Legitimate refers to conforming to the rules or laws or having a legal basis. Legal implies that something has been officially authorized or in conformity with the law. Lastly, permitted means allowed or granted to do or have something. All of these words represent the opposite of un-sanctioned.