nonductile
/ˌnɒndʌkˈtaɪl, ˌnɒnˈdʌktʌɪl/Definitions
1. adjective
not able to be drawn or shaped by heating
“The nonductile properties of the metal made it difficult to mold.”
2. noun
a material that cannot be drawn or shaped by heating
“The engineer searched for a nonductile material to use in the construction project.”