[{"Bold_text": "adjective", "List Items": ["costing ; expensive; high in price:a costly emerald bracelet; costly medical care.Synonyms: high-priced , dear", "resulting in great expense:The upkeep of such a large house is costly.", "resulting in great detriment:It was a costly mistake because no one ever trusted him again.", "of great value; very valuable; sumptuous.", "lavish; extravagant."]}]