Hypertext Webster Gateway: "imponderable"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (wn)
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"
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