Definition of unutterable adjective from the Oxford Advanced American Dictionary

 

unutterable

 adjective
adjective
NAmE//ʌnˈʌt̮ərəbl//
 
[only before noun](formal)
 
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used to emphasize how great a particular emotion or quality is unutterable sadness He felt like an unutterable fool.
unutterably
 
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NAmE//ʌnˈʌt̮ərəbli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: unutterable