(specialist) (of metal, etc.) that can be hit or pressed into different shapes easily without breaking or cracking (= starting to split) (Oxford)
A malleable substance is easily changed into a new shape (Cambridge)
easily influenced, trained, or controlled (Cambridge)
Lead and tin are malleable metals. (Cambridge)
He had an actor's typically malleable features. (Cambridge)
malleable metals
malleable features of a person
Adaptable
Flexible
Rigid
Unadaptable
Malleability