WordWeb Online

1. [informal] Of questionable motive; of doubtful legality, value, truth, honesty, etc.
   "there was something fishy about the accident";
   - funny, shady [informal], suspect, suspicious, dodgy [Brit, informal]
    
2. Of or relating to or resembling fish
   "the soup had a fishy smell"

Derived forms: fishier, fishiest

See also: questionable

Encyclopedia: Fishy