The phrase "am buoyant" refers to feeling cheerful, positive, and optimistic. The antonyms for this phrase include words like depressed, downcast, and pessimistic. Feeling depressed refers to feeling down, sad, and lacking in energy. Being downcast indicates a general sense of gloom or despondency, while being pessimistic means expecting the worst possible outcome. Other antonyms for "am buoyant" might include words like morose, despondent, disheartened, and discouraged. These terms all suggest a lack of hope or a negative outlook on life. Therefore, if you are not feeling buoyant, you may want to try to find ways to shift your perspective and improve your mood.