Longman Dictionary of Contemporary English homepage

unthinkable

 adjective
     
un‧think‧a‧ble
1 impossible to accept or imagine:
It is unthinkable that a mistake like this could have happened.
it would be unthinkable for somebody to do something
It would be unthinkable for me to stay anywhere but with the family.
2

the unthinkable

something that is impossible to accept or imagine:
Then the unthinkable happened and the boat started to sink.
It was the job of the committee to think the unthinkable (=plan for unexpected events or situations).
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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