[{"Bold_text": "adjective", "List Items": ["of, showing, or characterized by deep thought.", "of grave or somber disposition, character, or manner:a serious occasion; a serious man.Synonyms: staid , sedate , sober", "being in earnest; sincere; not trifling:His interest was serious.Antonyms: trifling , frivolous", "requiring thought, concentration, or application:serious reading; a serious task.", "weighty or important:a serious book; Marriage is a serious matter.Synonyms: grave , momentous Antonyms: trivial", "giving cause for apprehension; critical :The plan has one serious flaw.", "Medicine/Medical.(of a patient's condition) having unstable or otherwise abnormal vital signs and other unfavorable indicators, as loss of appetite and poor mobility: patient is acutely ill."]}, {"Bold_text": "noun", "List Items": ["that which is of importance, grave, critical, or somber:You have to learn to separate the serious from the frivolous."]}]