WordWeb Online

1. Filled with shade
   "the shady side of the street";
   - shadowed, shadowy, umbrageous
    
2. Quiet, dark, or concealed
   "her shady past intrigued him"; "a shady part of town"
    
3. [informal] Of questionable motive; of doubtful legality, value, truth, honesty, etc.
   "a shady deal";
   - fishy [informal], funny, suspect, suspicious, dodgy [Brit, informal]

Derived forms: shadier, shadiest

See also: concealed, questionable, shaded

Encyclopedia: Shady, New York