The move by China to devalue its currency for the second day meant global volatility continued unabated. Rupee, under pressure, fell to a 23-month low at one point.
There was no good news on the reforms front too. Lingering doubt over the fate of the key GST Bill and caution ahead of announcement of macro data -- IIP for June and CPI inflation for July to be released later in the day -- dampened sentiment, brokers said.
Of the 30-share Sensex pack, 23 lost while 7 gained.
The NSE Nifty index went below the crucial 8,400-mark before settling lower 112.90 points, or 1.33 per cent, at 8,349.45.
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"Uncertainty over the fate of a key GST Bill and rupee depreciating to nearly two-year low spooked the markets," said Deppak Pahwa, a Delhi-based stock broker.
According to market players, persistent selling by foreign investors amid fears that passage of the GST Bill might get delayed due to continued protests by the Opposition and unimpressive earning numbers bogged down markets.
Realty, metal, oil and gas, PSU and banking sectors were hit hardest.
But IT was the silver lining as Infosys, TCS and Wipro rose up to 3.39 per cent, backed by a firming dollar.
The broader markets too felt the heat, with the BSE mid-cap and small-cap indices falling 2.49 per cent and 2.13 per cent, respectively.
Globally, stock markets remained shaky after China lowered the value of its currency for the second day in a row, aggravating worries about the health of the world's number two economy.
Foreign portfolio investors (FPIs) net sold shares worth Rs 736.81 crore yesterday, as per provisional exchange data.