[{"Bold_text": "adverb", "List Items": ["with the head foremost; headfirst :to plunge headlong into the water.", "without delay; hastily :to plunge headlong into work.", "without deliberation; rashly:to rush headlong into battle."]}, {"Bold_text": "adjective", "List Items": ["undertaken quickly and suddenly; made precipitately; hasty :a headlong flight.", "rash ; impetuous :a headlong denunciation.", "done or going with the head foremost:a headlong dive into the pool."]}]