The dollar struggled against the yen and Swiss Franc as rising tensions in Ukraine offset optimism about U.S. economic growth.
The euro struggled to make headway on Thursday amid caution before a speech by ECB President Mario Draghi.
The US dollar was weakened by falling equity prices, Treasury yields, and a slower-than-expected expansion in the US manufacturing sector.
The European Central Bank's Mario Draghi made clear the euro's strength is a possible trigger to ease monetary policy.
A record Japanese trade deficit in the fiscal year fueled the dollar's rise against the yen, but tensions in Ukraine were likely to limit losses.
The dollar fell against a basket of currencies on Thursday after Federal Reserve chief Janet Yellen reiterated an accommodative monetary policy stance.
The yen fell on Wednesday, hit by comments by Japan's finance minister that traders took as a sign of a weaker yen.
The yen fell against the dollar and the euro on Wednesday, on pension fund comments by Japan's finance minister.
The euro fell after the European Central Bank said it will be forced to ease further if the currency keeps going up.
The dollar lost 2.5 percent against the yen since last Friday, on guidance that the Federal Reserve will not soon raise base interest rates.
The dollar hit a three-week low on Thursday after minutes from the Federal Reserve's March meeting disappointed dollar bulls.
The dollar bounced back a third of a percent against the yen after a steep slide against Japan's currency.
The dollar fell to a 10-day low against the yen after the Bank of Japan refrained from additional monetary easing.
The dollar lost ground against the yen and dipped versus the euro after U.S. jobs data last week disappointed.
EM currencies have rallied against the dollar after Friday's U.S. jobs number, with some forex experts predicting an interesting period ahead for the asset class.
The dollar fell on Friday after U.S. non-farm payrolls showed job growth necessary for the Fed to wind up its asset purchasing program.
The euro dropped on Thursday after the European Central Bank pledged to use unconventional measures if needed to battle low inflation.
The euro was steady against the dollar after the ECB's policy decision, where they failed to cut rates to boost euro zone growth.
The British pound was strengthened by construction purchasing manager's index, even after other disappointing construction data.
The yen reached a fresh six-year low on the New Zealand dollar on Monday, as safe-haven demand waned amid hopes of more stimulus from China.