He is a man of unmalleable habits, and wears his dress of the same fashion as that of twenty years ago.
"Passages From The American Notebooks, Volume 1" by Nathaniel Hawthorne
But the course of events is sometimes a most unmalleable thing, as he was presently to learn.
"The Honorable Senator Sage-Brush" by Francis Lynde
Both as pliable as elastic, and as unmalleable.
"Christopher Hibbault, Roadmaker" by Marguerite Bryant
But her qualities were like his own, tough and unmalleable, and in the midst of his anger he had admired her resolution.
"The Divorce of Catherine of Aragon" by J.A. Froude