Source : Webster's Revised Unabridged Dictionary (1913)

Icy \I"cy\, a. [Compar. {Icier}; superl. {Iciest}.] [AS.
   [=i]sig. See {Ice}.]
   1. Pertaining to, resembling, or abounding in, ice; cold;
      frosty. ``Icy chains.'' --Shak. ``Icy region.'' --Boyle.
      ``Icy seas.'' --Pope.

   2. Characterized by coldness, as of manner, influence, etc.;
      chilling; frigid; cold.

            Icy was the deportment with which Philip received
            these demonstrations of affection.    --Motley.

Source : WordNet®

icy
     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}, {wintry}]
     2: extremely cold; "an arctic climate";  "a frigid day"; "gelid
        waters of the North Atlantic"; "glacial winds"; "icy
        hands"; "polar weather" [syn: {arctic}, {frigid}, {gelid},
         {glacial}, {polar}]
     3: covered with or containing or consisting of ice; "icy
        northern waters"
     4: shiny and slick as with a thin coating of ice; "roads and
        trees glazed with an icy film"
     [also: {iciest}, {icier}]