The Collaborative International Dictionary of English v.0.48:

Torpid \Tor"pid\ (t[^o]r"p[i^]d), a. [L. torpidus, fr. torpere
   to be stiff, numb, or torpid; of uncertain origin.]
   1. Having lost motion, or the power of exertion and feeling;
      numb; benumbed; as, a torpid limb.
      [1913 Webster]

            Without heat all things would be torpid. --Ray.
      [1913 Webster]

   2. Dull; stupid; sluggish; inactive. --Sir M. Hale.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Torpid \Tor"pid\, n. [See Torpid, a.] [Slang, Oxford
   University, Eng.]
   1. An inferior racing boat, or one who rows in such a boat.
      [Webster 1913 Suppl.]

   2. pl. The Lenten rowing races.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

torpid
    adj 1: slow and apathetic; "she was fat and inert"; "a sluggish
           worker"; "a mind grown torpid in old age" [syn: inert,
           sluggish, soggy, torpid]
    2: in a condition of biological rest or suspended animation;
       "dormant buds"; "a hibernating bear"; "torpid frogs" [syn:
       dormant, hibernating(a), torpid]

Moby Thesaurus II by Grady Ward, 1.0:

139 Moby Thesaurus words for "torpid":
   Laodicean, Olympian, abeyant, abiding, aloof, apathetic, benumbed,
   blah, blase, bored, cataleptic, catatonic, changeless, comatose,
   constant, continuing, dead, debilitated, desensitized, detached,
   disinterested, dopey, dormant, droopy, drugged, dull, durable,
   enduring, enervated, exanimate, faineant, firm, fixed, flat, foul,
   frozen, groggy, heartless, heavy, hebetudinous, hopeless, immobile,
   immutable, in a stupor, in abeyance, in suspense, inactive,
   inanimate, indifferent, indolent, inert, insouciant, intact,
   inviolate, jaded, lackadaisical, languid, languorous, lasting,
   latent, leaden, lethargic, lifeless, listless, logy, lumpish,
   moribund, motionless, nonchalant, numb, numbed, passive, permanent,
   perpetual, persistent, phlegmatic, pluckless, pococurante, pooped,
   quiescent, remaining, resigned, rigid, sated, sedentary, slack,
   sleeping, sleepy, slothful, slow, slow-moving, slow-paced,
   sluggish, slumbering, slumberous, smoldering, sodden, solid,
   somnolent, soporific, spiritless, spunkless, stable, stagnant,
   stagnating, standing, static, stationary, staying, steadfast,
   stoic, stultified, stupefied, stupid, supine, suspended, sustained,
   tame, unaltered, unaroused, uncaring, unchangeable, unchanged,
   unchanging, unchecked, unconcerned, undestroyed, unfading,
   unfailing, uninterested, unshifting, unvaried, unvarying,
   vegetable, vegetative, wan, weary, withdrawn, world-weary