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

 

unutterable

 adjective
adjective
BrE BrE//ʌnˈʌtərəbl//
 
; NAmE NAmE//ʌnˈʌtərəbl//
 
[only before noun](formal)
 
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used to emphasize how great a particular emotion or quality is unutterable sadness He felt such an unutterable fool.
See the Oxford Advanced American Dictionary entry: unutterable