The Collaborative International Dictionary of English v.0.48:

Waterless \Wa"ter*less\, a.
   Destitute of water; dry. --Chaucer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

waterless
    adj 1: lacking sufficient water or rainfall; "an arid climate";
           "a waterless well"; "miles of waterless country to cross"
           [syn: arid, waterless]

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "waterless":
   Saharan, anhydrous, arid, athirst, bone-dry, desert, droughty, dry,
   dry as dust, dusty, high and dry, juiceless, like parchment,
   moistureless, sandy, sapless, sere, thirsting, thirsty, undamped,
   unwatered