The antonyms for the word "out humor" could be anything that is melancholic or gloomy. Some of the antonyms for this phrase could be sadness, seriousness, solemnity, depression, dejection, sullenness or desolation. Out humor is usually associated with a cheerful or lively mood, so the antonyms would be words that represent the opposite of that feeling. It is important to note that humor can be subjective, and what one may find amusing, another may not. Nevertheless, antonyms of out humor try to capture the negative or downside of human emotion, which makes it an important language tool when expressing oneself accurately.