The word "demeritorious" refers to actions or behaviors that are harmful or deserving of blame or criticism. Antonyms for this adjective include "meritorious," which describes actions that are praiseworthy or deserving of recognition and reward. Other antonyms include "beneficial," "constructive," "virtuous," "commendable," and "admirable," all of which describe positive behaviors or outcomes. By using these antonyms, we can emphasize the importance of positive actions and encourage others to strive for excellence and success in their endeavors.