The Collaborative International Dictionary of English v.0.48:

Verdant \Ver"dant\, a. [F. verdoyant, p. pr. of verdoyer to be
   verdant, to grow green, OF. verdoier, verdeier, fr. verd,
   vert, green, fr. L. viridis green, fr. virere to be green:
   cf. OF. verdant verdant, L. viridans, p. pr. of viridare to
   make green. Cf. Farthingale, Verjuice, Vert.]
   1. Covered with growing plants or grass; green; fresh;
      flourishing; as, verdant fields; a verdant lawn.
      [1913 Webster]

            Let the earth
            Put forth the verdant grass.          --Milton.
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   2. Unripe in knowledge or judgment; unsophisticated; raw;
      green; as, a verdant youth. [Colloq.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

verdant
    adj 1: characterized by abundance of verdure

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "verdant":
   aestival, beryl-green, berylline, blue-green, bluish-green,
   caespitose, chartreuse, chloranemic, chlorine, chlorotic, citrine,
   citrinous, emerald, foliaged, glaucescent, glaucous,
   glaucous-green, graminaceous, grasslike, grassy, green,
   green as grass, green-blue, greenish, greenish-blue,
   greenish-yellow, greensick, holly, ivy, ivy-green, leafy, leaved,
   meadowy, moss-covered, moss-grown, mossy, olivaceous, olive,
   olive-green, porraceous, smaragdine, springlike, summerlike,
   summery, swardy, tufted, turflike, turfy, verdured, verdurous,
   vernal, vernant, vert, virescent, yellowish-green