[syn: crisp, frosty, nipping, nippy, snappy]
The Collaborative International Dictionary of English v.0.48:
Frosty \Frost"y\, a. [Cf. AS. fyrstig.]
   1. Attended with, or producing, frost; having power to
      congeal water; cold; freezing; as, a frosty night.
      [1913 Webster]
   2. Covered with frost; as, the grass is frosty.
      [1913 Webster]
   3. Chill in affection; without warmth of affection or
      courage. --Johnson.
      [1913 Webster]
   4. Appearing as if covered with hoarfrost; white;
      gray-haired; as, a frosty head. --Shak.
      [1913 Webster]
WordNet (r) 3.0 (2006):
frosty
    adj 1: devoid of warmth and cordiality; expressive of
           unfriendliness or disdain; "a frigid greeting"; "got a
           frosty reception"; "a frozen look on their faces"; "a
           glacial handshake"; "icy stare"; "wintry smile" [syn:
           frigid, frosty, frozen, glacial, icy, wintry]
    2: covered with frost; "a frosty glass"; "hedgerows were rimed
       and stiff with frost"-Wm.Faulkner [syn: frosty, rimed,
       rimy]
    3: pleasantly cold and invigorating; "crisp clear nights and
       frosty mornings"; "a nipping wind"; "a nippy fall day";
       "snappy weather" [syn: crisp, frosty, nipping, nippy,
       snappy]
Moby Thesaurus II by Grady Ward, 1.0:
145 Moby Thesaurus words for "frosty":
   Olympian, affectless, aloof, anesthetized, arctic, argent,
   argentine, autistic, backward, bashful, blank, blunt, canescent,
   catatonic, chalky, chill, chilled, chilly, cold, cold as charity,
   cold-blooded, coldhearted, constrained, cool, cretaceous, detached,
   disaccordant, discreet, dispassionate, distant, drugged, dull,
   emotionally dead, emotionless, exclusive, expressionless,
   fleecy-white, forbidding, freezing, frigid, frost-beaded,
   frost-chequered, frost-covered, frost-fettered, frost-rent,
   frostbound, frosted, frostlike, frosty-faced, frozen, gelid,
   glacial, grizzled, grizzly, guarded, heartless, hoar, hoar-frosted,
   hoary, icy, immovable, impassible, impassive, impersonal,
   inaccessible, incompatible, inexcitable, inhospitable, inimical,
   insusceptible, introverted, lactescent, lily-white, marble,
   marmoreal, milky, modest, nippy, niveous, nonemotional, objective,
   obtuse, offish, out of touch, passionless, platinum, pure white,
   remote, removed, repressed, reserved, restrained, reticent,
   retiring, rime-frosted, rimed, seclusive, self-absorbed,
   semidiaphanous, semiopaque, semipellucid, semitransparent, shivery,
   shrinking, silver, silvered, silvery, snow-white, snowy, soulless,
   spiritless, standoff, standoffish, strained, subdued, suppressed,
   swan-white, tense, unaffable, unaffectionate, unamiable,
   unamicable, unapproachable, uncongenial, uncordial,
   undemonstrative, unemotional, unexpansive, unfeeling, unfriendly,
   ungenial, unharmonious, unimpassioned, unimpressionable, unloving,
   unpassionate, unresponding, unresponsive, unsociable,
   unsusceptible, unsympathetic, untouchable, white, white as snow,
   withdrawn