The rupee resumed sharply lower at 65.73 per dollar as against yesterday's level of 65.54 at the Interbank Foreign Exchange (Forex) market.
It moved in a range of 65.81 and 65.69 per dollar during the morning deals before quoting 65.75 at 1030 hrs.
The dollar index was down by 0.54 per cent at 95.46 as against a basket of six currencies in the early trade.
Oil prices resumed their downward trend in early Asian trade with the US benchmark on track for its eighth weekly decline, pulled lower by weaker global stock markets and concerns over an economic slowdown in China.
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The dollar withered near six-week lows in early Asian trade, reflecting doubts whether the Federal Reserve will be able to safely raise interest rates next month as once expected, given accumulating signs of stress in many parts of the global economy.
Meanwhile, the benchmark 30-share index was trading lower by 386.78 points, or 1.40 per cent, at 27,221.04 at 1035 hrs.