The timing of this innovation proved unfortunate The 1962/63 winter was an exceptionally cold one in Europe.

It had proven unfortunate for the world and for America.

The choice of date proved unfortunate for several reasons.

A side-effect of the new regulations could prove unfortunate for some employers.

This proved unfortunate for history, as in Sutherland's own words:

There was other work to do - and this delay might prove unfortunate.

Even this little speculation proved unfortunate for the purchaser, as the public could not be induced to take the necessary interest in the matter.

Rincewind tried to back away, but that proved unfortunate since there was a guard behind him.

The other one did not prove so unfortunate.

Separation proved unfortunate to his marriage, which ended in divorce in 1962.