The antonyms for the word "most demeritorious" are words that have positive connotations, meaning they describe something that is praiseworthy or commendable. Some possible antonyms might include "meritorious," "commendable," "laudable," "worthy," or "exemplary." These words all suggest excellence or deserving of praise, rather than the negative qualities suggested by demeritorious. By contrast, antonyms to demeritorious could be used to describe someone or something that is worthy of recognition and admiration, such as a heroic act, a kind gesture, or an exceptional achievement. Ultimately, antonyms to "most demeritorious" describe positive attributes rather than negative ones, bringing to mind concepts of goodness, virtue, and excellence.