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

 

unimaginable

 adjective
adjective
BrE BrE//ˌʌnɪˈmædʒɪnəbl//
 
; NAmE NAmE//ˌʌnɪˈmædʒɪnəbl//
 
(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
See the Oxford Advanced American Dictionary entry: unimaginable