unspeakably
adverb
UK/ʌnˈspiː.kə.bli/
US/ʌnˈspiː.kə.bli/
Definitions of unspeakably adverb
in a manner that is too extreme or shocking to be expressed in words.
The news was unspeakably sad.
He suffered unspeakably during that time.
The performance was unspeakably bad.