Humorless is commonly used to describe someone who lacks a sense of humor or is incapable of appreciating jokes and comedy. However, there are various other synonyms that can be used to describe such individuals. For instance, such people can be called gloomy, solemn, unamusing, or unsmiling. They can also be referred to as joyless, straight-faced, uncomical, or as lacking a sense of wit. If someone frequently responds with a lack of humor, they may also be described as dour, sour-faced, unenthusiastic, or lacking in merriment. All these synonyms serve to describe a person who is generally not open to humor or laughter in everyday life.