unspeakable


Concise Oxford English Dictionary © 2008 Oxford University Press:
unspeakable/ʌnˈspiːkəbl/
adjective not able to be expressed in words.

■ too bad or horrific to express in words.

– derivatives
unspeakableness noun,
unspeakably adverb.
'unspeakable' also found in these Oxford entries:

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