Nobody knows for sure how many copies have been sold around the world, but 100 million is probably an underestimate .
Nevertheless, this is still an underestimate , because it doesn't consider all the factors.
Even after his landslide election victory last year, they continue to underestimate him.
The findings suggest that official estimates based on surveys of the public significantly underestimate the extent of alcohol abuse in the country.
However, I would also add that one should not underestimate the importance of the influence of the editor in getting ideas signed off.
For a start, many people grossly underestimate the time their project will take and, as a result, jobs either don't get completed or are rushed.
Back on his home patch, people are less likely to underestimate him.
She has fought her fair share of demons and to underestimate her now would prove a serious error of judgement.
I wish people wouldn't underestimate me, or my strength, or my weakness.
But it could be a mistake for political opponents to underestimate him.