Merit refers to an excellent quality of something or someone. If one has merit, they are skilled, qualified or deserving of some recognition. Conversely, de-merit refers to a lack of merit or bad quality of something or someone. Antonyms for demeriting could be, lauding, commending, or praising. To commend someone is to express approval or respect for their accomplishments, while to praise means to admire or congratulate. These antonyms imply that someone or something is deserving of recognition or appreciation. To use these antonyms in a sentence, one might say, "Her diligence is commendable," or "I must praise you for your insightful contribution.