The phrase "unimaginable consequences" is a valid and usable phrase in written English.
You can use it to describe things that are so severe that they are difficult to imagine. For example, "The consequences of global warming on our planet are unimaginable."
It's Democrats who are warning the country about the unimaginable consequences of default, and many Republicans who are minimizing it.
Baron Cohen responded by releasing a video in character warning of "unimaginable consequences" if he was not allowed to attend.
Because France is not France without Arab oil, Chirac has suddenly taken to threatening Saddam with "war of unimaginable consequences" unless he disarms right away, and France will soon dispatch an aircraft carrier to the gulf.
In 2009 special envoy Richard Holbrooke warned Prince Mohammed bin Nayef of "unimaginable" consequences for Saudi Arabia if Pakistan fell apart, especially if its nuclear weapons fell into unfriendly hands.
"While I applaud the Academy for taking away my rights to free speech," he said, "I am outraged at being banned from the Oscars by the Academy of Motion Picture Arts and Zionists!" If they do not give him back his tickets, he warned, they will face "unimaginable consequences".
There is a one-in-ten chance of the world being 6C warmer than it is today by 2100 which would lead to cataclysmic changes in the global climate with unimaginable consequences for human civilisation, leading climate researchers have warned in an "Earth Statement".
If we harmonize time, "the effect on the human mind and nature will be of unimaginable consequence," Mr. Argüelles said in an e-mail message from his aerie on the slopes of Mount Hood in Oregon.
That kind of thing is one sort of British racism; not exactly malevolent, but unthinking and with consequences unimaginable to the perpetrator, who hardly suspects offence has been given.
Otherwise the consequences are unimaginable.
We are riding the crest of a worldwide wave whose consequences are unimaginable, and which holds perhaps the only real basis for optimism for our planet and its inhabitants.
[I] The SA creativity test [Society_For_Creative_Minds, 1969], which measures creativity through divergent thinking, involves three types of tasks (generate unique ways of using typical objects, imagine desirable functions for ordinary objects, and imagine the consequences of unimaginable things happening).
