US gold futures edged 0.4 percent lower to $1,203.7 per ounce.
Last week, the metal posted its biggest weekly decline since August after the Fed reaffirmed its monetary tightening stance, seen as a negative for non-yielding bullion.
"Of the hawkish message we got from the Fed last week, we are now seeing the aftermath," said Bart Melek, head of commodity strategies at TD Securities.
"We are now right below the 50-day (moving average) at $1,210. Trading range right now is $1,180 to $1,240 and we are going to need a catalyst to get us moving higher up."
The dollar index, which measures the greenback against a basket of six major currencies, rose to its highest since June 2017, denting gold's appeal by making it more expensive for holders of other currencies to buy the metal.
Gold prices have fallen about 12 percent since a peak in April after investors preferred the dollar as the US-China trade war unfolded against a background of higher US interest rates.
In Britain, doubts that the government will be able to secure a Brexit agreement, as well as Rome facing a Tuesday deadline to submit a revised Italian budget to the European Union, also supported the dollar.
"The main driver (for gold) has been some renewed dollar strengthening... due to political uncertainty in UK and Italy," said Saxo Bank analyst Ole Hansen, adding that $1,200 is "both the psychological and technical level of support" for the metal.
Silver fell 1.2 percent to $13.98 per ounce, touching its lowest since Sept. 11.
Palladium dipped 1.4 percent to $1,103.30 per ounce, while platinum rose 0.5 percent at $845 an ounce.