Breaking eight sessions of gains, the Sensex today fell 106 points as investors took profit and adopted a cautious approach ahead of September-quarter GDP data.
The national output numbers are due this week.
Consumer durables, pharma and oil & gas and PSU stocks suffered losses.
The 30-share Sensex after opening a shade higher quickly slipped into the red, but settled down 105.85 points, or 0.31 percent at 33,618.59.
The index had risen 964 points in the past eight sessions on the back of unabated buying by domestic institutional investors (DIIs) and Moody's India's sovereign rating upgrade.
The 50-share NSE Nifty too dropped 29.30 points, or 0.28 percent, at 10,370.25. Intra-day, it traded between 10,355.20 and 10,409.55.
Global leads were mixed. Concerns about sustained capital outflows by foreign funds remained.