Definition of unimaginable | Bee Dictionary of English

The scene below him was one of almost unimaginable carnage.
And last year, with Brokeback Mountain, yet another unimaginable success, both with critics and audiences, he captivated the entire world and reached the pinnacle of moviemaking.
When family conflict erupts in murder, bereaved survivors usually say the outburst was unforeseeable, unimaginable.

The mystery of Merion ready to unfold
Thanks for the welcome, but what should we expect? Unimaginable weather and an enigmatic course offer mystery at the U.S. Open.
June 12, 2013 - The Golf Channel
Rural Colorado Counties Threaten Secession From State
It sounds implausible and unimaginable for a state to want to secede from the United States, let alone counties within a particular state, but county commissioners in rural parts of northern Colorado are pushing forward with a plan to segregate. This measure would allow them to become their own independent state apart from Colorado. Easier [...] Rural Colorado Counties Threaten Secession From ...
June 10, 2013 - The Inquisitr
Adult learners overcome obstacles to earn diplomas
Donning the ceremonial cap and gown is never an easy achievement, but when juggling jobs, children, spouses overseas in the military and bills, it becomes a moment of near unimaginable accomplishment.
June 8, 2013 - The Titusville Herald

Daniel Day-Lewis in Guardian Unlimited
We should leave him alone and we should leave his family alone to suffer their unimaginable grief in private, and it's not going to happen,Day-Lewis said backstage. "We should just stop encouraging people to have greater and greater...
Prince Charles in Victoria Star
Charles told some 150 business leaders in Rio de Janeiro that "the best projections tell us that we have less than 100 months to alter our behaviour before we risk catastrophic climate change and the unimaginable horrors that this would bring."
Cristiano Ronaldo in AFP
I feel a broken man, completely disconsolate, frustrated and an unimaginable sadness,he said.