The Collaborative International Dictionary of English v.0.48:

Pliable \Pli"a*ble\, a. [F., fr. plier to bend, to fold. See
   Ply, v.]
   1. Capable of being plied, turned, or bent; easy to be bent;
      flexible; pliant; supple; limber; yielding; as, willow is
      a pliable plant.
      [1913 Webster]

   2. Flexible in disposition; readily yielding to influence,
      arguments, persuasion, or discipline; easy to be
      persuaded; -- sometimes in a bad sense; as, a pliable
      youth. "Pliable she promised to be." --Dr. H. More.
      [1913 Webster] -- Pli"a*ble*ness, n. -- Pli"a*bly,
      adv.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pliable
    adj 1: susceptible to being led or directed; "fictile masses of
           people ripe for propaganda" [syn: fictile, pliable]
    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]
    3: able to adjust readily to different conditions; "an adaptable
       person"; "a flexible personality"; "an elastic clause in a
       contract" [syn: elastic, flexible, pliable, pliant]
    4: capable of being bent or flexed or twisted without breaking;
       "a flexible wire"; "a pliant young tree" [syn: bendable,
       pliable, pliant, waxy]

Moby Thesaurus II by Grady Ward, 1.0:

126 Moby Thesaurus words for "pliable":
   abulic, accessible, adaptable, afraid, amenable, appliable,
   applicable, apt, bendable, bending, bendy, biddable, bright,
   clever, compliant, convenient, cowardly, creased, crimped, docile,
   dog-eared, doubled, ductile, educable, elastic, exploitable,
   extensible, extensile, fabricable, facile, faint, fainthearted,
   feasible, feeble, feebleminded, fictile, flexible, flexile,
   flexuous, flounced, fluted, foldable, folded, folding, foolproof,
   formable, formative, frail, gathered, giving, handy, impressible,
   impressionable, infirm, influenceable, instructable, intelligent,
   invertebrate, like putty, limber, lissome, lithe, lithesome,
   malleable, manageable, maneuverable, manipulable, manipulatable,
   moldable, motivated, movable, open, open-minded, operable,
   persuadable, persuasible, pervious, plaited, plastic, pleated,
   pliant, plicate, plicated, plicatile, practical, quick, quilled,
   ready, receptive, responsive, reusable, ripe for instruction,
   ruffled, schoolable, sensitive, sequacious, shapable, spineless,
   springy, suasible, submissive, suggestible, supple, susceptible,
   swayable, teachable, thirsty for knowledge, tractable, tractile,
   trainable, tucked, twilled, untroublesome, usable, utilizable,
   weak, weak-kneed, weak-minded, weak-willed, whippy, wieldable,
   wieldy, willing, willowy, workable, yielding