What is the opposite of 'somber'?

The term 'somber' refers to a mood or atmosphere that is serious, dark, or gloomy. Therefore, the opposite of 'somber' would be a word that conveys a sense of brightness, happiness, or lightness. 'Joyful' perfectly captures this contrast, as it indicates a state of great happiness or delight, which is in stark contrast to the serious and gloomy connotation of 'somber.'

Other words like 'melancholy' imply a deep, reflective sadness, which does not oppose the seriousness of 'somber.' 'Serious' shares a similar tone and mood, and 'dark' relates more to the absence of light or a gloomy feeling, rather than the opposite of a cheerful or bright disposition. Therefore, 'joyful' is the most fitting opposite to 'somber.'