The pound sterling, subject to high volatility this week, fell on Thursday against the main currencies including the euro and the dollar, as traders increasingly seriously considering an exit from the EU of the United Kingdom without agreement.

The British currency lost 0.79% against the euro, which was trading for 90.88 pence, and 0.57% against the greenback, to 1.3322 dollars around 10:10 GMT (11:10 in Paris).

"The chances of reaching an agreement" between the European Union (EU) and the United Kingdom "are clearly diminishing over time," said Neil Wilson, an analyst at Markets.com.

"The announcement of a new deadline for post-Brexit negotiations - and, this time, probably definitive - has hardly reassured the pound," added Connor Campbell of Spreadex.

The fate of the post-Brexit negotiations will indeed be decided by Sunday, announced Wednesday British Prime Minister Boris Johnson and the President of the European Commission Ursula von der Leyen, after a dinner in Brussels where they again took note of their deep differences.

"Very large gaps remain between the two sides and it is not yet clear whether these can be bridged," a Downing Street source said after the meeting.

Also acting on "very distant" positions, Ursula von der Leyen evoked "a lively discussion".

The position of the president of the European Commission "is not a good starting point to reach an agreement in the end," said You-Na Park-Heger, of Commerzbank.

The pound is also suffering the effects of economic growth that slows in the United Kingdom, to +0.4% in October against +1.1% the previous month, according to figures published Thursday by the Office for National Statistics (ONS).

Ahead of a meeting of the European Central Bank (ECB), which is expected to further amplify its already massive support for the eurozone economy on Thursday, the European currency rose 0.21% against the greenback to $1.2108.

The institution chaired by Christine Lagarde will unveil its measures at midday.