[{"Bold_text": "noun", "List Items": ["the act or practice of biting one's fingernails, especially as the result of anxiety or nervousness.", "Informal.nervousness:The announcement that the trade agreement had been signed ended a week of nail-biting on Wall Street."]}, {"Bold_text": "adjective", "List Items": ["Informal.causing nervousness:The nail-biting part of the canoe trip was through the stretches of white water."]}]