Definition of "imponderable" in English

adjective

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

2. Difficult or impossible to comprehend or evaluate.

noun

1. (physics) A substance or body, which is not ponderable, i.e., which not does not having a detectable amount of matter or measurable mass. An imponderable substance or body; specifically, in the plural, a name formerly applied to heat, light, electricity, and magnetism.

2. An imponderable question.

3. A factor that cannot be anticipated.