unspeakable

1 ENTRIES FOUND:
unspeakable /ˌʌnˈspiːkəbəl/ adjective
unspeakable
/ˌʌnˈspiːkəbəl/
adjective
Britannica Dictionary definition of UNSPEAKABLE
[more unspeakable; most unspeakable]
1 
: very bad or evil
2 
: impossible to describe in words

— unspeakably

/ˌʌnˈspiːkəbli/ adverb