WordWeb Online

1. Devoid of warmth and cordiality; expressive of unfriendliness or disdain
   "got a frosty reception";
   - frigid, frozen, glacial, icy, wintry
    
2. Covered with frost
   "a frosty glass";
   - rimed, rimy
    
3. Pleasantly cold and invigorating
   "crisp clear nights and frosty mornings";
   - crisp, nipping, nippy [informal], snappy [informal]

Derived forms: frostier, frostiest

See also: cold

Encyclopedia: Frosty