The Collaborative International Dictionary of English v.0.48:

Wooden \Wood"en\, a.
   1. Made or consisting of wood; pertaining to, or resembling,
      wood; as, a wooden box; a wooden leg; a wooden wedding.
      [1913 Webster]

   2. Clumsy; awkward; ungainly; stiff; spiritless.
      [1913 Webster]

            When a bold man is out of countenance, he makes a
            very wooden figure on it.             --Collier.
      [1913 Webster]

            His singing was, I confess, a little wooden. --G.
                                                  MacDonald.
      [1913 Webster]

   Wooden spoon.
      (a) (Cambridge University, Eng.) The last junior optime
          who takes a university degree, -- denoting one who is
          only fit to stay at home and stir porridge. "We submit
          that a wooden spoon of our day would not be justified
          in calling Galileo and Napier blockheads because they
          never heard of the differential calculus." --Macaulay.
      (b) In some American colleges, the lowest appointee of the
          junior year; sometimes, one especially popular in his
          class, without reference to scholarship. Formerly, it
          was a custom for classmates to present to this person
          a wooden spoon with formal ceremonies.

   Wooden ware, a general name for buckets, bowls, and other
      articles of domestic use, made of wood.

   Wooden wedding. See under Wedding.
      [1913 Webster]

WordNet (r) 3.0 (2006):

wooden
    adj 1: made or consisting of (entirely or in part) or employing
           wood; "a wooden box"; "an ancient cart with wooden
           wheels"
    2: lacking ease or grace; "the actor's performance was wooden";
       "a wooden smile"

Moby Thesaurus II by Grady Ward, 1.0:

97 Moby Thesaurus words for "wooden":
   arid, awkward, barren, blah, blank, bloodless, blunt, blunt-witted,
   buckram, bumbling, cardboard, characterless, clumsy, cold,
   colorless, dead, deadpan, dim, dim-witted, dismal, dopey, draggy,
   drearisome, dreary, dry, dryasdust, dull, dull of mind,
   dull-headed, dull-pated, dull-witted, dusty, effete, elephantine,
   empty, etiolated, expressionless, fade, fat-witted, fishy, flat,
   gauche, glassy, gross-headed, halting, ham-handed, heavy,
   heavy-handed, hebetudinous, ho-hum, hollow, impassive, inane,
   inept, inexcitable, inexpressive, insipid, jejune, leaden,
   lifeless, low-spirited, maladroit, muscle-bound, obtuse, pale,
   pallid, pedestrian, plodding, pointless, poker-faced, poky,
   ponderous, slow, slow-witted, sluggish, solemn, spiritless,
   sterile, stiff, stilted, stodgy, stuffy, superficial, tasteless,
   tedious, thick-brained, thick-headed, thick-pated, thick-witted,
   thickskulled, unexpressive, unhandy, unhappy, unlively, vacant,
   vapid, weighty