Circularized is a word that refers to the process of distributing information or materials to various individuals or groups in a circular manner. Antonyms for circularized include "localized," which refers to targeting a specific area or group, rather than spreading information broadly. Another antonym is "individualized," which refers to tailoring messages or materials to specific individuals. Lastly, "personalized" is another antonym, referring to creating a customized experience for each recipient. All of these antonyms focus on a more targeted and personalized approach to disseminating information, rather than a broadly distributed circular message.