Found 2 items, similar to imponderable.
English → English (WordNet) Definition: imponderable imponderable adj : difficult or impossible to evaluate with precision; “such imponderable human factors as aesthetic sensibility” [ant: ponderable] n : a factor whose effects cannot be accurately assessed; “human behavior depends on many imponderables”
English → English (gcide) Definition: Imponderable Imponderable \Im*pon"der*a*ble\, a. [Pref. im- not + ponderable: cf. F. impond['e]rable.] Not ponderable; without sensible or appreciable weight; incapable of being weighed. [1913 Webster] Imponderable \Im*pon"der*a*ble\, n. (Physics) An imponderable substance or body; specifically, in the plural, a name formerly applied to heat, light, electricity, and magnetism, regarded as subtile fluids destitute of weight but in modern science little used. [1913 Webster]