The Collaborative International Dictionary of English v.0.48:

Involute \In"vo*lute\, Involuted \In"vo*lu`ted\, a. [L.
   involutus, p. p. of involvere. See Involve.]
   1. (Bot.) Rolled inward from the edges; -- said of leaves in
      vernation, or of the petals of flowers in [ae]stivation.
      --Gray.
      [1913 Webster]

   2. (Zool.)
      (a) Turned inward at the margin, as the exterior lip of
          the Cyprea.
      (b) Rolled inward spirally.
          [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "involuted":
   Byzantine, ambagious, anfractuous, balled up, circuitous,
   circumlocutory, complex, complicated, confounded, confused,
   convoluted, convolutional, crabbed, daedal, devious, elaborate,
   embrangled, entangled, flexuose, flexuous, fouled up, implicated,
   intricate, involute, involutional, involved, knotted, labyrinthian,
   labyrinthine, loused up, many-faceted, matted, mazy, meandering,
   meandrous, messed up, mixed up, mucked up, multifarious, perplexed,
   ramified, rivose, rivulose, roundabout, ruffled, screwed up,
   serpentine, sinuate, sinuose, sinuous, snaky, snarled, subtle,
   tangled, tangly, torsional, tortile, tortuous, turning, twisted,
   twisting, twisty, whorled, winding, wreathlike, wreathy