Cheesing, also known as smiling excessively, can be seen as a positive thing in many situations. However, the opposite of cheesing would be to frown or scowl, which may express unhappiness or displeasure. Other antonyms for cheesing could include pouting, moping, or sulking - all of which denote a negative or unhappy emotion. Another antonym for cheesing could be stoic or indifferent, which suggests a lack of emotion or expression. While cheesing can often reflect a joyful or positive disposition, it's important to remember that displaying a range of emotions is healthy and necessary for well-being.