Definition of ineffable
1a
: incapable of being expressed in words : indescribable
ineffable joy
b
: unspeakable
ineffable disgust
2
: not to be uttered : taboo
the ineffable name of Jehovah
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Merriam-Webster unabridged
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Time Traveler for ineffable
The first known use of ineffable was in the 14th century
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