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adj. That cannot undergo precise evaluation: imponderable problems.

adj. Not ponderable; without sensible or appreciable weight; incapable of being weighed.

n. An imponderable substance or body; specifically, in the plural, a name formerly applied to heat, light, electricity, and magnetism.

adj. Not ponderable; without sensible or appreciable weight; incapable of being weighed.

n. 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.

Not ponderable; not capable of being weighed; without gravity.

n. In physics, a thing which has no weight: a term formerly applied to heat, light, electricity, and magnetism, on the supposition that they were material substances, and still used of the hypothetical universal medium, ether.

n. a factor whose effects cannot be accurately assessed

adj. difficult or impossible to evaluate with precision

"We have no knowledge that the luminiferous ether is attracted by gravity; it is sometimes called imponderable because some people vainly imagine that it has no weight; I call it matter with the same kind of rigidity that this elastic jelly has."

influence   

unsubstantial   

leavening    leaven   

weightless    imponderous   

impalpable    intangible    incommunicable    indivisible    all-searching