Seaton spent day after day with the Brain, computing, calculating, thinking with a clarity and a cogency hitherto impossible, all to one end.

Whoever has ready access to both the Oracle Computer and the Book of Magic will have power to remake both frames in a manner hitherto impossible.

Britain's The Guardian said that Barney "should be hailed for making compulsive drinking a source of comedy on US TV, a hitherto impossible dream."

Because these viruses attack only humans, it has been impossible hitherto to study them in animals.

In 'The Collector', it is also money that enables Clegg to act on his hitherto impossible plan to abduct Miranda.

Satellite navigation allows for hitherto impossible precision in the delivery of weapons to targets, greatly increasing their lethality whilst reducing inadvertent casualties from mis-directed weapons.

In a Flash, by scientific method, in fact achieves the hitherto impossible.

Cliff Marsland had achieved the hitherto impossible.

Red Vision evolved a series of unique production techniques and a sophisticated animation pipeline to deliver the weekly topical elements of the series to hitherto impossible deadlines.

Immediately after the partial privatisation, the company managed breakthroughs that were hitherto impossible due to the direct influence of the Ministry of Culture.