The Collaborative International Dictionary of English v.0.48:

Moldable \Mold"a*ble\, Mouldable \Mould"a*ble\, a.
   Capable of being molded or formed.
   [1913 Webster] Moldboard

WordNet (r) 3.0 (2006):

moldable
    adj 1: capable of being molded or modeled (especially of earth
           or clay or other soft material); "plastic substances such
           as wax or clay" [syn: fictile, moldable, plastic]

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "moldable":
   adaptable, apt, bendable, bending, biddable, bright, clever,
   compliant, docile, ductile, educable, elastic, extensible,
   extensile, fabricable, facile, fictile, flexible, flexile,
   flexuous, formable, formative, giving, impressible, impressionable,
   instructable, intelligent, like putty, limber, lissome, lithe,
   lithesome, malleable, motivated, plastic, pliable, pliant, quick,
   ready, receptive, responsive, ripe for instruction, schoolable,
   sensitive, sequacious, shapable, springy, submissive, supple,
   susceptible, teachable, thirsty for knowledge, tractable, tractile,
   trainable, whippy, willing, willowy, yielding