The Collaborative International Dictionary of English v.0.48:

Dryness \Dry"ness\, n.
   The state of being dry. See Dry.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dryness
    n 1: the condition of not containing or being covered by a
         liquid (especially water) [syn: dryness, waterlessness,
         xerotes] [ant: wetness]
    2: moderation in or abstinence from alcohol or other drugs [syn:
       sobriety, dryness]
    3: objectivity and detachment; "her manner assumed a dispassion
       and dryness very unlike her usual tone" [syn: dispassion,
       dispassionateness, dryness]

Moby Thesaurus II by Grady Ward, 1.0:

129 Moby Thesaurus words for "dryness":
   acerbity, acescency, acidity, acidulousness, appetite, aridity,
   aridness, barrenness, birth control, bloodlessness, cacophony,
   canine appetite, characterlessness, coarseness, colorlessness,
   contraception, cracked voice, deadness, dearth, dearth of ideas,
   discord, dismalness, dragginess, dreariness, drought, dry womb,
   dullness, dustiness, effeteness, emptiness, empty stomach,
   etiolation, family planning, famine, flatness, greenness,
   gruffness, gutturalism, gutturality, gutturalness, harshness,
   heaviness, hoarseness, hollow hunger, hollowness, hunger,
   hungriness, huskiness, hyperacidity, impotence, inanity,
   ineffectualness, inexcitability, infecundity, infertility,
   insipidity, insipidness, jejunity, leadenness, lifelessness,
   lowness of spirit, paleness, pallor, planned parenthood,
   pointlessness, pokiness, polydipsia, ponderousness, prosaicism,
   prosaicness, prosaism, prosiness, pungency, raspiness, raucity,
   relish, roughness, rudeness, scrapiness, scratchiness, slowness,
   solemnity, sour, sourishness, sourness, spiritlessness, staidness,
   sterileness, sterility, stertorousness, stiffness, stodginess,
   stolidity, stomach, stuffiness, subacidity, superficiality,
   sweet tooth, tapeworm, tartishness, tartness, taste, tastelessness,
   tediousness, thickness, thirst, thirstiness, throatiness,
   torment of Tantalus, ugliness, uncreativeness, unfancifulness,
   unfertileness, unfruitfulness, unimaginativeness,
   uninterestingness, unliveliness, unoriginality, unpoeticalness,
   unproductiveness, unripeness, unsweetness, vapidity, vapidness,
   verjuice, vinegariness, vinegarishness, withered loins,
   woodenness