American English

Definition of unimaginable adjective from the Oxford Advanced American Dictionary

 

unimaginable

 adjective
adjective
NAmE//ˌʌnɪˈmædʒənəbl//
 
(formal)
 
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impossible to think of or to believe exists; impossible to imagine unimaginable wealth This level of success would have been unimaginable just last year. opposite imaginable
unimaginably
 
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NAmE//ˌʌnɪˈmædʒənəbli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: unimaginable