[{"Bold_text": "adjective", "List Items": ["changeable; volatile; fickle; flighty; erratic:a mercurial nature.Synonyms: indecisive , inconstant Antonyms: steady , constant", "animated; lively; sprightly; quick-witted.Synonyms: spirited Antonyms: phlegmatic", "pertaining to, containing, or caused by the metal mercury .", "(initial capital letter)of or relating to the god Mercury.", "(initial capital letter)of or relating to the planet Mercury."]}, {"Bold_text": "noun", "List Items": ["Pharmacology.a preparation of mercury used as a drug."]}]