Being down in the mouth is a phrase used to describe feeling sad, disappointed, or discouraged. Antonyms for this phrase include feeling happy, content, satisfied, and optimistic. When someone is happy, they are joyful and full of positive energy. Content people are at peace with their current situation and do not need anything else to feel complete. Those who are satisfied have achieved their goals and feel a sense of accomplishment. Finally, being optimistic means having a hopeful outlook on the future, even in difficult times. These antonyms are good reminders that negative emotions are temporary and can be replaced with positive ones.