Judaism sees this One, True God as a singular, ineffable, undefinable being.
From the en.wikipedia.org
A Parmesan rind adds undefinable flavor and richness to any dish in which it simmers.
From the sfgate.com
Delete Totally subjective and undefinable term for another music sub genre.
From the en.wikipedia.org
Software quality isn't some kind of undefinable black box that we can't discern or control.
From the economist.com
Perhaps more important is the undefinable ability of Brees to lead.
From the bostonherald.com
Standards for the Medal of Honor are vague, if not undefinable.
From the theatlantic.com
Ever fascinating, if almost undefinable, is the status rating of the nation's major universities.
From the time.com
This track was both moving and, in its seamless mix of hip-hop, soul and space-age rock, undefinable.
From the washingtonpost.com
Anonymous takes great pains to be undefinable and amorphous.
From the cnn.com
More examples
Indefinable: not capable of being precisely or readily described; not easily put into words; "an indefinable feeling of terror"; "an abstract concept that seems indefinable"
Undefinable is the debut album of Huang Yida , released in 2004.