insusceptible

Isn’t the real value intangible and insusceptible to economic metrics?

One-thousandth of a drop of virulent anthrax blood invariably killed the guinea-pig, while it left the rabbit unharmed.2 Klein has never found a rabbit insusceptible.

We find it strong, pliable, insusceptible to either heat or cold and to all appearances will be more durable than anything we have ever used.

Investigation shows the opaque substances to be generally most susceptible, and the transparent materials, such as glass, rock-salt, tourmaline, &c. almost insusceptible, to the heating effect of the sun.

These grave questions are as yet insusceptible of answer.