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immalleable

adjective
im·​malleable | \ (ˈ)i(m), ə+\

Definition of immalleable

: lacking malleability : unyielding, rigid

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First Known Use of immalleable

1650, in the meaning defined above

History and Etymology for immalleable

in- entry 1 + malleable

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The first known use of immalleable was in 1650

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