The word "unprohibited" means something that is allowed or not prohibited. Therefore, its antonyms would include "prohibited," "forbidden," "banned," "restricted," "limited," "constrained," "restrained," and "inhibited." All these words imply that the action or thing in question is not permitted or allowed. Similarly, if something is said to be "prohibited," it means that it is not allowed or may result in legal or social consequences. Thus, knowing antonyms helps to understand the exact meaning of a word and use it appropriately in different contexts.