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Use "ineffableness" in a sentence
"It's said that the best things can't be talked about because no tongue can describe it and we're stuck with language that can only be a descriptive referral to thethings that refer to this ineffableness (is that a word?)"
"The more describable and circumscribed the world becomes, the more its ineffableness appeals."
"The mother realises in her child the great Idea, which is in every child, the ineffableness of which, however, is not revealed to any one else."