imponderable
im·pon·de·rable
adjective
1.
difficult or impossible to evaluate with precision
- “such imponderable human factors as aesthetic sensibility”
noun
1.
Origin
From im- + ponderable.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.