The antonyms for the phrase "most jollying" are words that convey the opposite meaning. These words include depressing, somber, funereal, cheerless, gloomy, and mournful. Depressing implies a sense of sadness and low spirits. Somber refers to a dark, serious, and grave mood. Funereal expresses a feeling of sorrow and mourning. Cheerless describes something that is dull and lacking in enthusiasm. Gloomy refers to a dismal or dismal atmosphere, while mournful implies deep sadness and grief. Overall, these antonyms paint a picture of a sad and melancholic environment that is a far cry from the uplifting and joyful atmosphere associated with "most jollying.