It is a synonym for "assume"
Reckoned.
Animal Atlas - 2004 Birds to be Reckoned With was released on: USA: 4 February 2011
She is an amazing person, and is a force to be reckoned with.
Beckoned, second
Biography - 1987 Mark Hamill A Force to be Reckoned With was released on: USA: 21 May 2002
Very formidable. A force to be reckoned with.
Face Off - 2011 A Force to Be Reckoned With 3-1 was released on: USA: 21 August 2012
Hungary is generally reckoned a part of Central Europe.
The phrase a force to be reckoned with is usually applied to ideas or things that are considered so big, so strong or so important that they cannot be ignored and must be confronted or taken into consideration
There are reckoned to be 92 days in the northern hemisphere summer.
google said that.