1) Too great, too wonderful to be expressed or described in mere words. An indescribable feeling, person or thing that exists only in fleeting thoughts.

2) A term used by an angel to describe the Plan of God; Her Ineffable Plan. Separate from the Great Plan.
by yuor-devil August 31, 2019
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Ineffablr means the link between two loving fictional beings, those being the Demon, Crowley and the Angel, Aziraphale
“Do you like the ineffable husbands?”

“Are you fucking joking? I love it!”
by skinskinskin, we all love skin January 27, 2020
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A thing which cannot be expressed or described.
I found his performance to be confusing and, to tell the truth, totally ineffable.
by E. Gerald Hensel April 30, 2007
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Incapable of being expressed in words; unspeakable; unutterable; indescribable.
Not to be uttered; taboo.
We named our crew team's boat ineffable
by Hart May 07, 2005
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