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imponderable (adj.)

1794, "weightless," from assimilated form of in- (1) "not, opposite of" + ponderable (see ponder). Figurative use, "unthinkable," from 1814. As a noun from 1829, originally meaning heat, light, electricity, etc., as having no weight. Related: Imponderably; imponderability. Imponderous is attested from 1640s as "without weight." Imponderabilia "unthinkable things collectively" is attested from 1835.

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Definitions of imponderable from WordNet

imponderable (adj.)
difficult or impossible to evaluate with precision;
such imponderable human factors as aesthetic sensibility
From wordnet.princeton.edu