The antonyms for the phrase 'making merry' are to be sober, to be sad, and to be dull. Instead of making merry, an individual can keep a straight face, refrain from drinking alcoholic beverages, and engage in serious conversations. Other antonyms for the phrase include being quiet and solitary. It is important to keep in mind that making merry may not always be appropriate, and it is essential to be mindful of the situation and the people around us. Therefore, in certain settings, it is best to be more reserved and serious.