And later, it was considered unthinkable that anyone would purposely trigger this disaster.

It was as if those speaking had considered the unthinkable: Were their phone lines, which cost thousands, really impregnable?

But excavation there is considered unthinkable for both diplomatic and religious reasons, he concedes.

It is an idea once considered unthinkable, and still widely viewed here as unlikely.

For example, things considered unthinkable a few years ago are now standard practices.

Most such structural reforms have been considered politically unthinkable - until now.

That possibility has long been considered unthinkable in Albany from the standpoint of both policy and politics.

The aft double berth, which just five years ago was considered unthinkable in a 30-footer, is now standard.

Exposing 19-year-olds to American college life, without political supervision, was considered unthinkable.

Most of his recommendations would have been considered unthinkable a few years ago.