Sterling tumbled as low as $1.0327, an all-time nadir, and last traded 3.34% weaker at $1.0490.
A former top Japanese currency official said Monday that policymakers likely won't try to defend a certain level, such as the 145 mark, but only conduct any further operations to smooth volatility.
read moreThe dollar index was 0.76% higher at 114, and earlier reached 114.58 for the first time since May 2002.
Fellow commodity currency the Canadian dollar reached a fresh trough at C$1.3625 per greenback, its weakest since July 2020.
China's offshore yuan slid to a new low of 7.1630 per dollar, its weakest level since May 2020.