Origin: Latin suffix -able
Imponderable has 4 different meanings across 2 categories:
a factor whose effects cannot be accurately assessed
"human behavior depends on many imponderables"
An imponderable substance or body; specifically, in the plural, a name formerly applied to heat, light, electricity, and magnetism.
difficult or impossible to evaluate with precision
"such imponderable human factors as aesthetic sensibility"
Not ponderable; without sensible or appreciable weight; incapable of being weighed.