The Sensex succumbed to the pressure, before ending down 10.11 points, or 0.04 per cent, at 26,633.13.
The gauge had gained 47.79 points in the previous session.
NSE Nifty also closed in negative territory with a minuscule fall of 1.75 points, or 0.02 per cent, at 8,190.50.
Sentiment soured after services PMI contracted for the second straight month and the all-crucial GST meet remained deadlocked over dual control, compensation and high-sea taxes.
The upcoming corporate results season and the approaching Union Budget kept investors on their toes.
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Demonetisation took its toll on the Indian services sector in December as the business activity contracted for the second consecutive month amid steeper reduction in incoming new orders, a monthly survey showed today.
The Nikkei India Services Purchasing Managers' Index (PMI), which tracks services sector companies on a monthly basis, stood at 46.8 in December, little changed from November's 46.7, indicating a further solid contraction in output.
The major losers on the 30-share Sensex were RIL 1.99 per cent, ICICI Bank 1.26 per cent and Cipla 1.05 per cent.
Banking dropped, along with oil and gas, PSU and metal.
The broader markets showed a mixed trend with small-cap jumping 0.47 per cent and the mid-cap declining 0.09 per cent.
Hong Kong shares declined by 0.07 per cent while Japan's Nikkei rose 2.51 per cent and Shanghai gained 0.73 per cent. In Europe, Frankfurt's DAX fell 0.17 per cent, Paris CAC 0.01 per cent and London's FTSE was down 0.03 per cent as investors awaited flash inflation figures for the euro zone.
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