Source : Webster's Revised Unabridged Dictionary (1913)

Frosty \Frost"y\, a. [Cf. AS. fyrstig.]
   1. Attended with, or producing, frost; having power to
      congeal water; cold; freezing; as, a frosty night.

   2. Covered with frost; as, the grass is frosty.

   3. Chill in affection; without warmth of affection or
      courage. --Johnson.

   4. Appearing as if covered with hoarfrost; white;
      gray-haired; as, a frosty head. --Shak.

Source : WordNet®

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}, {frozen}, {glacial}, {icy}, {wintry}]
     2: covered with frost;  "a frosty glass"; "hedgerows were rimed
        and stiff with frost"-Wm.Faulkner [syn: {rimed}, {rimy}]
     3: pleasantly cold and invigorating; "crisp clear nights and
        frosty mornings"; "a nipping wind"; "a nippy fall day";
        "snappy weather"; (`parky' is a British term) [syn: {crisp},
         {nipping}, {nippy}, {snappy}, {parky}]
     [also: {frostiest}, {frostier}]