[{"Bold_text": "adjective", "List Items": ["happening by chance or accident ;not planned; unexpected :an accidental meeting.Synonyms: unintentional Antonyms: contrived , planned", "nonessential ; incidental ; subsidiary :accidental benefits.", "Music.relating to or indicating sharps, flats, or naturals."]}, {"Bold_text": "noun", "List Items": ["a nonessential or subsidiary circumstance, characteristic, or feature.", "Music.a sign placed before a note indicating a chromatic alteration of its pitch."]}]