nonmalleable

adjective
non·​mal·​lea·​ble | \ ˌnän-ˈma-lē-ə-bəl How to pronounce nonmalleable (audio) , -ˈmal-yə-bəl, -ˈma-lə-bəl\

Definition of nonmalleable

: incapable of being shaped or altered : not malleable nonmalleable cast-iron pipe fittings … he berates conventional views that animals … have a fixed, nonmalleable nature.— Robert A. Segal

First Known Use of nonmalleable

1829, in the meaning defined above

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The first known use of nonmalleable was in 1829

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not to be persuaded, moved, or stopped

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