Nifty and Sensex opened lower on November 21, impacted by global and domestic issues, including rising geopolitical tensions from the Russia-Ukraine conflict and a $250 million bribery indictment against Gautam Adani. At 9:30 am, the Sensex fell 404.68 points (0.52%) to 77,173.70, while the Nifty dropped 147.20 points (0.63%) to 23,371.30, with a significant number of shares declining amid a cautious market atmosphere.