unutterably
adverb/ʌnˈʌtərəbli/
/ʌnˈʌtərəbli/
(formal)- extremely; used to emphasize how great a particular emotion or quality is
- Life on a hospital ward can be unutterably dull.
Oxford Collocations DictionaryUnutterably is used with these adjectives:- sad
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unutterably