ineffable
ɪnˈɛfəb(ə)l/
adjective
adjective: ineffable
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too great or extreme to be expressed or described in words.“the ineffable mysteries of the soul”
synonyms: inexpressible, indescribable, beyond words, beyond description, beggaring description;More -
not to be uttered.“the ineffable Hebrew name that gentiles write as Jehovah”
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Origin
late Middle English: from Old French, or from Latin ineffabilis, from in- ‘not’ + effabilis (see effable).

