[{"Bold_text": "adjective", "List Items": ["of very great area or extent; immense :the vast reaches of outer space.Synonyms: stupendous , colossal , gigantic , boundless , measureless Antonyms: small", "of very great size or proportions; huge ; enormous :vast piles of rubble left in the wake of the war.", "very great in number, quantity, amount, etc.:vast sums of money.", "very great in degree, intensity, etc.:an artisan of vast skill."]}, {"Bold_text": "noun", "List Items": ["Literary.an immense or boundless expanse or space."]}]