General Costa Gomes, nicknamed the Cork for his ability to stay afloat in crises, dealt with considerable political and social instability.

We believe that the world is passing through a period of considerable instability and therefore we do not propose further reductions in our defence forces.

Landspouts most often occur in drier areas with high-based storms and considerable low-level instability.

"But considerable instability remains."

This conclusion, if correct, would cause considerable taxonomic instability.

Philip's attempts to issue new currency - in particular the issues of the copper vélon coinage in 1603-4, 1617 and 1621 - simply created considerable instability.

However, the late 19th century monetary system still worked reasonably well - despite considerable instability in the underlying gold base - because of its international character.

A period of considerable instability followed.

Today's basic stability will mean considerable instability for some countries.

It has been described as a "considerable instability".