All 5 Uses

intangible
in
The Rainbow Trail
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He admitted the improbability of her existence, but lost nothing of the persistent intangible hope that drove him.†
Chpt 1 *
The fathers, as far as he was concerned, were as intangible as myths.†
Chpt 6
Shefford imagined there was some resemblance in her to the lily—the same whiteness, the same rich gold, and, more striking than either, a strange, rare quality of beauty, of life, intangible as something fleeting, the spirit that had swiftly faded from the plucked flower.†
Chpt 7
He held his love as a thing aloof, and, as such, intangible because of the living death she believed she lived, it had no warmth and intimacy for them.†
Chpt 12
To make a name of this heretofore intangible man, to give him an identity apart from the crowd, to be able to recognize him—that for Shefford would be fatal.†
Chpt 13

Definitions:

(1) (intangible)
unable to be physically touched (existing but not material or concrete); or something that is hard to identify
(2) (meaning too rare to warrant focus)