That certainty has vanished, and with it much of the underground's identity.

Now, on the eve of the election, the certainty of the spring has vanished.

All his certainty vanished.

The cerebral certainties of a second ago vanish.

It is a confusing, disturbing, threatening world in which all the certainties of Communist life have vanished.

But in the ruthless new airline industry, where no carrier is resoundingly healthy, such certainty has vanished.

A moment later his certainty vanished as one of the birds gripped the windowsill and made an effort to perch.

Jack's certainties had vanished an hour ago: his neat isosceles triangle had fled down the wind, routed by a thousand fresh unknown quantities.

If she did that, she knew it could fall apart in skeins, any one of which might be relevant, but the original certainty would vanish.

Still, the calm certainty she had felt only moments ago had vanished under a wave of nerves and needs.