The Collaborative International Dictionary of English v.0.48:

Torpor \Tor"por\, n. [L., from torpere, to be torpid.]
   [1913 Webster]
   1. Loss of motion, or of the motion; a state of inactivity
      with partial or total insensibility; numbness.
      [1913 Webster]

   2. Dullness; sluggishness; inactivity; as, a torpor of the
      mental faculties.
      [1913 Webster]

WordNet (r) 3.0 (2006):

torpor
    n 1: a state of motor and mental inactivity with a partial
         suspension of sensibility; "he fell into a deep torpor"
         [syn: torpor, torpidity]
    2: inactivity resulting from lethargy and lack of vigor or
       energy [syn: listlessness, torpidity, torpidness,
       torpor]