The opposite of "feels bitter" would be "feels sweet." When something is sweet, it has a pleasant taste, and it is often associated with happiness and satisfaction. In contrast, bitterness is often linked to sadness, disappointment, and unpleasant experiences. Other antonyms for "feels bitter" could be "enjoyable," "pleasurable," or "delicious." The choice of antonym depends on the context in which the phrase is used. If the phrase is used to describe a person's emotional state, synonyms could include "happy," "content," or "satisfied." While the antonyms for "feels bitter" convey positive emotions, it is essential to note that bitterness can also be a natural and necessary part of life.