The Collaborative International Dictionary of English v.0.48:

Flexuous \Flex"u*ous\, a. [L. flexuosus, fr. flexus a bending,
   turning.]
   1. Having turns, windings, or flexures.
      [1913 Webster]

   2. (Bot.) Having alternate curvatures in opposite directions;
      bent in a zigzag manner.
      [1913 Webster]

   3. Wavering; not steady; flickering. --Bacon.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

curved \curved\ adj.
   1. not straight; having or marked by curves. Opposite of
      straight.

   Note: [Narrower terms: arced, arched, arching, arciform,
         arcuate, bowed; falcate, sickle-shaped; flexuous;
         incurvate, incurved: recurved, recurvate;
         semicircular: serpentine, snaky: sinuate, sinuous,
         wavy: sinusoidal]

   Syn: curving.
        [WordNet 1.5]

   2. (Botany) curved with the micropyle near the base almost
      touching its stalk; -- of a plant ovule. Opposite of
      orthotropous.

   Syn: campylotropous.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

flexuous
    adj 1: having turns or windings; "the flexuous bed of the
           stream"

Moby Thesaurus II by Grady Ward, 1.0:

86 Moby Thesaurus words for "flexuous":
   adaptable, ambagious, anfractuous, bendable, bending, bendy,
   chevronwise, chevrony, circuitous, circumlocutory, compliant,
   convoluted, convolutional, crankled, crooked, curvy, ductile,
   elastic, extensible, extensile, fabricable, facile, fictile,
   flexible, flexile, flexuose, formable, formative, giving, hairpin,
   impressible, impressionable, involute, involuted, involutional,
   labyrinthine, like putty, limber, lissome, lithe, lithesome,
   malleable, mazy, meandering, meandrous, moldable, plastic, pliable,
   pliant, receptive, responsive, rivose, rivulose, roundabout,
   ruffled, sensitive, sequacious, serpentine, shapable, sinuate,
   sinuose, sinuous, snaky, springy, staggered, submissive, supple,
   susceptible, torsional, tortile, tortuous, tractable, tractile,
   turning, twisting, twisty, whippy, whorled, willowy, winding,
   wreathlike, wreathy, yielding, zigzag, zigzaggy, zigzagways