Seriousness is a quality that is characterized by a lack of frivolity, seriousness of purpose, and a sense of responsibility. SEDATENESS is a state of being calm and composed, while COOLNESS is the quality of being composed and unemotional. THOUGHTFULNESS is the quality of being considerate and mindful of others, and SOLEMNITY is a state of being serious and dignified. GRAVITAS is a quality of seriousness and IMPORTANCE, and DEPTH is the quality of being profound or meaningful. EARNEST is a quality of being sincere and serious, and IMPORTANCE is the quality of being significant or consequential. ENORMITY is the quality of being immense or extreme, and SIGNIFICANCE is the quality of being important or meaningful. WEIGHT is the quality of being heavy or significant, and GRAVITY is the quality of being serious or important. EARNESTNESS is the quality of being sincere and serious, SEVERITY is the quality of being strict or harsh, and SOBRIETY is the quality of being serious and restrained. All of these qualities are related to the term seriousness, and together they help to define it.