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That cannot undergo precise evaluation: imponderable problems.

im·pon′der·a·ble n.
im·pon′der·a·bil′i·ty n.
im·pon′der·a·bly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
Archer, who seemed to be assisting at the scene in a state of odd imponderability, as if he floated somewhere between chandelier and ceiling, wondered at nothing so much as his own share in the proceedings.
To have ethics as a central element in the thematization of the contemporary world is attentive to the imponderability character of History, it seeks to explain possibilities and differences, not control them (ARAUJO and RANGEL 2015; RANGEL and SANTOS 2015).
(seriously) We are going to experiment a new product in a state of imponderability, in a future space shuttle.