Able to be hammered or rolled into a new shape; easily influenced or persuaded by others.
She hasn't discouraged her son's religious devotion, though she voices concern that he has always been eager to please, and may be too malleable in the hands of his imam.
Lionel Shriver, Telegraph, 13 August 2006, Telegraph
reviewing John Updike's Terrorist. Amazon
His obsessive tidiness, his volatile moods, his spasms of disappointment that his real sons and daughters turned out to be less malleable than his fictional offspring: he was a father in a million, and for his children that wasn't necessarily a good thing.
Robert Douglas-Fairhurst, Telegraph, 20 August 2006, Telegraph
reviewing Lucinda Hawksley's Katey: the Life and Loves of Dickens's Artist Daughter. Amazon
Anonymous blacksmiths added tin to copper and made an alloy that is much stronger and yet also more malleable than copper - bronze.
Jonathan Weiner, The New York Times, 18 December 2005, New York Times
reviewing Clifford Conner's A People's History of Science: Miners, Midwives, and "Low Mechanicks". Amazon