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Definition of unthinkable adjective from the Oxford Advanced American Dictionary

 

unthinkable

 adjective
adjective
NAmE//ʌnˈθɪŋkəbl//
 
unthinkable (for somebody) (to do something) unthinkable (that…)
 
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impossible to imagine or accept synonym inconceivable It was unthinkable that she could be dead. opposite thinkable
the unthinkable
 
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noun [singular] Suddenly the unthinkable happened and he pulled out a gun. The time has come to think the unthinkable (= consider possibilities that used to be unacceptable).See unthinkable in the Oxford Advanced Learner's Dictionary
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