Not ponderable; without sensible or appreciable weight; incapable of being weighed.
Difficult or impossible to comprehend or evaluate.
An imponderable question.
A factor that cannot be anticipated.
An imponderable substance or body; specifically, in the plural, a name formerly applied to heat, light, electricity, and magnetism.
Able to be treated as fact; real or concrete.
Comprehensible by the mind; understandable.
Touchable; able to be touched or felt; perceptible by the sense of touch.
Perceptible; able to be perceived.
A physical object; something that can be touched.
Real or concrete results.