Sobersidedly is an adverb that suggests seriousness, thoughtfulness, and solemnity. Some synonyms for this word include gravely, somberly, earnestly, soberly, and seriously. Gravely is often used to describe a situation that is serious and solemn, while somberly suggests a sense of gloom or sadness. Earnestly is a synonym that implies a genuine and heartfelt commitment or dedication to a task or idea. Soberly is another option that suggests a clear-minded and rational approach to a situation. Overall, these synonyms capture the essence of sobersidedly as a word that conveys a sense of gravity and seriousness.