The antonyms for the word "unhappiest" include words such as "happiest," "joyful," "pleased," "content," "satisfied," "elated," "overjoyed," and "blissful." These words can be used to describe a variety of positive emotions, such as feeling happy or ecstatic. They are often used to describe a sense of satisfaction or contentment with one's life or current situation. When you're feeling your happiest, you're likely to be in a state of euphoria and feeling fulfilled. So, if you're feeling the opposite of this, it's important to take steps to address the issues causing unhappiness and work towards cultivating a happier, more satisfying life.