The Collaborative International Dictionary of English v.0.48:

Ductile \Duc"tile\, a. [L. ductilis, fr. ducere to lead: cf. F.
   ductile. See Duct.]
   1. Easily led; tractable; complying; yielding to motives,
      persuasion, or instruction; as, a ductile people.
      --Addison.
      [1913 Webster]

            Forms their ductile minds
            To human virtues.                     --Philips.
      [1913 Webster]

   2. Capable of being elongated or drawn out, as into wire or
      threads.
      [1913 Webster]

            Gold . . . is the softest and most ductile of all
            metals.                               --Dryden.
      -- Duc"tile*ly, adv. -- Duc"tile*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ductile
    adj 1: easily influenced [syn: ductile, malleable]
    2: capable of being shaped or bent or drawn out; "ductile
       copper"; "malleable metals such as gold"; "they soaked the
       leather to made it pliable"; "pliant molten glass"; "made of
       highly tensile steel alloy" [syn: ductile, malleable,
       pliable, pliant, tensile, tractile]

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "ductile":
   adaptable, bendable, bending, biddable, compliant, convenient,
   docile, elastic, extensible, extensile, fabricable, facile,
   feasible, fictile, flexible, flexile, flexuous, fluid, foolproof,
   formable, formative, giving, handy, impressible, impressionable,
   like putty, limber, liquid, lissome, lithe, lithesome, malleable,
   manageable, maneuverable, moldable, plastic, pliable, pliant,
   practical, receptive, responsive, sensitive, sequacious, shapable,
   springy, submissive, submitting, supple, susceptible, tractable,
   tractile, untroublesome, whippy, wieldable, wieldy, willowy,
   yielding