insusceptible

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

It has recently been claimed that pigs are insusceptible, but I have known of many instances in which the offal of anthrax cattle, when devoured by pigs, has determined fatal anthrax in the latter.

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.