Being down the mouth refers to a state of negativity or depression. The antonyms for this term include optimistic, cheerful, positive, upbeat, delighted, and content. The opposite of feeling down in the dumps is having a positive outlook on life, being upbeat, and embracing a positive attitude towards the future. Being content and happy with one's life can also be seen as antonyms of being down the mouth. It's important to remember that feelings of negativity are common, but it's vital to work towards a more positive state of being to improve mental and emotional health. Trying to cultivate a positive perspective is beneficial to leading a fuller and happier life.