The Collaborative International Dictionary of English v.0.48:

Curve \Curve\, v. t. [imp. & p. p. Curved (k[^u]rvd); p. pr. &
   vb. n. Curving.] [L. curvare., fr. curvus. See Curve, a.,
   Curb.]
   To bend; to crook; as, to curve a line; to curve a pipe; to
   cause to swerve from a straight course; as, to curve a ball
   in pitching it.
   [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):

curved
    adj 1: having or marked by a curve or smoothly rounded bend;
           "the curved tusks of a walrus"; "his curved lips
           suggested a smile but his eyes were hard" [syn: curved,
           curving] [ant: straight]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "curved":
   arched, arciform, bending, bent, billowing, billowy, bowed,
   curvaceous, curvate, curvated, curve, curvesome, curviform,
   curvilineal, curvilinear, curving, curvy, embowed, excurved,
   geosynclinal, incurvate, incurvated, incurved, incurving,
   labyrinthine, mazy, meandering, recurvate, recurvated, recurved,
   recurving, round, rounded, serpentine, sinuous, tortuous, twisted,
   twisting, undulant, wavy