[{"Bold_text": "noun", "List Items": ["the nail nailof the thumb .", "anything quite small or brief, as a small drawing or short essay.", "Printing.a small, rough dummy.", "Also called porkchop .Journalism, Printing.a half-column portrait in a newspaper."]}, {"Bold_text": "adjective", "List Items": ["quite small or brief; concise:a thumbnail description of Corsica."]}, {"Bold_text": "verb (used with object)", "List Items": ["to make a thumbnail sketch or description of."]}]