Definition of "unmalleable" [unmalleable]

• Not malleable. (adjective)

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• "But Ray Cruz, a gunnery sergeant in the United States Marine Corps, was one of those rare men with a personality of hard metal—unmalleable, impenetrable, unstoppable."
• "But Tom, as always, wanted to win; it was a part of his unmalleable personality, the least pleasant thing about him, the way he got fixed on something and all life ceased to exist except that issue."
• "It needs to be smolten and poured and once set, is pretty much unmalleable?"