That may be formed. In early use: Workable, plastic.

Of a substance or material: able to be worked, shaped, or manipulated; mouldable.

Capable of being fashioned, shaped, or moulded. Const. to, unto. Of a damaged article: Capable of being brought into shape. Obsolete.

Of a material: that can be (easily) moulded or shaped; pliant, pliable; that readily takes a new form.