Sudan's government claims that more than 9,000 people have been killed, although this figure is seen as a gross underestimate.

This is almost certainly a gross underestimate of Royalist losses.

Thus the number of endemic species is likely to be a gross underestimate.

Those numbers are almost certainly a gross underestimate, said a security adviser for a Western television network.

This is, almost certainly, a gross underestimate of the true number of suicides.

But those figures are regarded by many, including Russian soldiers, to be a gross underestimate.

These figure represent a gross underestimate of the human burden of disease.

Western diplomats say the figure is a gross underestimate.

This proved to be a gross underestimate; the final bill was over £11,000.

The planners say it will cost about $2 billion, a gross underestimate.