The Sensex gravitated in a range of more than 200 points before ending the session at 17,870, lower by 115 points and the Nifty shut shop at 5366, down 30 points.
More importantly, the NSE benchmark ended below the 5400 mark, which is considered crucial from the technical and derivatives point of view.
The midcap index ended at 6814, lower by 56 points and the smallcap index ended at 8174, down 75 points.
World stocks have touched three-month lows as Greece's 18-month sovereign debt crisis has brought its government to the brink of collapse; the austerity measures have resulted in pitched battles between the people and riot police.
Athens is seeking to make budget cuts worth 28 billion euros over the next four years to meet the eligibility requirements for the release of the next tranche of aid -- 12bn euros -- from the European Union and IMF.
There was red across the Asian Street, with the Hang Seng, Nikkei and Seoul shedding nearly a per cent each.
European markets are also having a bad session, with the FTSE, CAC and DAX losing around a percent each in mid-day trades, on fears that a Greek default could spark 'contagion' across Europe, inflicting major damage on big banks in France and Germany.
And the ripples are being felt back home.
Meanwhile, in a related development, the Greek Prime Minister George
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