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|Noun||1.||serious-mindedness - the trait of being serious; "a lack of solemnity is not necessarily a lack of seriousness"- Robert Rice|
trait - a distinguishing feature of your personal nature
commitment, committedness - the trait of sincere and steadfast fixity of purpose; "a man of energy and commitment"
graveness, gravity, soberness, sobriety, somberness, sombreness - a manner that is serious and solemn