unspeakable
noun C2- Something that cannot or must not be spoken about. · Near-synonym: unthinkable
Plural unspeakables
From the library
Rachel with unspeakable solemnity.
He contemplated with unspeakable delight the large diamond which shone on the major’s little finger; for the major, like a prudent man, in case of any accident happening to his bank-notes, had immediately converted them into an available asset.
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