At the forex market, after a weak opening, the Sensex at the Bombay Stock Exchange remained subdued, and had declined 117 points, or 0.4 percent, to 31,693 a short while ago. The Nifty at the National Stock Exchange had dropped 31 points, to 9,922. Other key Asian bourses in Japan, Hong Kong, South Korea and Singapore had lost between 0.1 percent and 0.8 percent.And at the forex market, the rupee had weakened 6 paise, to 64.17 against the dollar in afternoon deals.