Outlawing, which means to make something illegal, can have many antonyms depending on the context. Some possible antonyms include authorizing, legalizing, permitting, sanctioning, or validating. For instance, instead of outlawing a particular drug, the government may choose to legalize it for medicinal purposes. Similarly, instead of outlawing a particular behavior, a society may choose to authorize or sanction it through laws and regulations. The opposite of outlawing is to make something lawful, acceptable, or permissible. In short, the antonyms for outlawing signify the act of making something legitimate, authorized or acceptable.