The term "be sanctioned" can be defined as an official approval or authorization of something. The direct antonyms for this term are "be prohibited" and "be forbidden," which signify that a certain action or behavior is not allowed or approved. Contrarily, another antonym could be "be praised" or "be commended," which means that something is highly appreciated or esteemed. Additionally, "be encouraged" is also an antonym for "be sanctioned," as it means that someone is being inspired or motivated to pursue a particular course of action. Other possible antonyms may include "be disapproved," "be condemned," "be censured," and "be rejected.