Source : Webster's Revised Unabridged Dictionary (1913)

Arcadian \Ar*ca"di*an\, Arcadic \Ar*ca"dic\, a. [L. Arcadius,
   Arcadicus, fr. Arcadia: cf. F. Arcadien, Arcadique.]
   Of or pertaining to Arcadia; pastoral; ideally rural; as,
   Arcadian simplicity or scenery.

Source : WordNet®

arcadian
     adj : used of idealized country life; "a country life of arcadian
           contentment"; "a pleasant bucolic scene"; "charming in
           its pastoral setting"; "rustic tranquility" [syn: {bucolic},
            {pastoral}, {rustic}]
     n : an inhabitant of Arcadia