imponderable

A hot body was one which had absorbed an imponderable substance.

Matter was for the moment as subtle, as imponderable as soul.

We have not the slightest reason to believe that Aether is imponderable.

At all events the onus of proof rests with those who assert it is imponderable.

Likeness, dear Baron, is often the result of imponderable things.

The presence of imponderable fluids could not here be pleaded.

It is imponderable—can we conceive of matter without weight?

The air did not affect him; he was not only light, but imponderable.

Manifestly he came to her to get rid of the imponderable burden of the present.

What I might have gained is, in the scale, like imponderable air.