In testing the plane, Lindbergh and the engineers realized that it would be slightly unstable in flight.

'His knee is slightly unstable and we thought it best he saw the surgeon who performed the operation.'

It is usual to design the aircraft with a stable Dutch roll mode, but slightly unstable spiral mode.

Double beta decay would occur in seemingly stable nuclei put together in a slightly unstable configuration.

At the same time the slightly unstable design of the sole improves pressure distribution in the feet.

Dolour, her heart sinking, and her stomach feeling slightly unstable, stood looking after her.

This suggests it was a slightly unstable material such as aragonite, a form of calcium carbonate.

"Instead of building their homes in active volcanoes, which, though slightly unstable, provide an excellent source of heat, they build theirs in old dead mountains."

He glanced at me and added, "Personally, I think you are either slightly unstable or a very intelligent charlatan.

The first contained nothing but the observation: 'A cold, slightly unstable E'ly airflow will cover the region.'