The antonym for "proscribed" is "authorized". "Proscribed" means prohibited or forbidden, while "authorized" means permitted or approved. When an action or behavior is "proscribed", it is officially declared as illegal or wrong. On the other hand, when something is "authorized", it has been given the green light as acceptable or legal. For example, a drug may be "proscribed" by the FDA (Food and Drug Administration), meaning that it is not allowed to be sold or used. Conversely, a particular medication may be "authorized" by the same agency, indicating that it has been deemed safe and effective for use.