Definition of unthinkable adjective from the Oxford Advanced Learner's Dictionary

 

unthinkable

 adjective
adjective
BrE BrE//ʌnˈθɪŋkəbl//
 
; NAmE NAmE//ʌnˈθɪŋkəbl//
 
 
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unthinkable (for somebody) (to do something) | unthinkable (that…) impossible to imagine or accept synonym inconceivable It was unthinkable that she could be dead. opposite thinkableExtra examples It’s unthinkable for something like this to happen. This course of action would have been unthinkable to the Russian generals. This would have been considered unthinkable only a decade ago.
See the Oxford Advanced American Dictionary entry: unthinkable

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