Being overjoyed is a wonderful feeling but sometimes we need to express more nuanced emotions. Antonyms for the phrase "being overjoyed" could include feeling disappointed, sad, depressed, disheartened, discouraged, or despondent. These emotions may arise due to various reasons, such as setbacks, failures, or losses, and they require a different approach or attitude to overcome them. Nevertheless, feeling any of these emotions is part of the human experience and can inspire growth and resilience. Therefore, it's important to acknowledge and accept our feelings instead of suppressing them, as this leads to better emotional well-being and helps us lead more fulfilling lives.