Source : Webster's Revised Unabridged Dictionary (1913)

Agrestic \A*gres"tic\, a. [L. agrestis, fr. ager field.]
   Pertaining to fields or the country, in opposition to the
   city; rural; rustic; unpolished; uncouth. ``Agrestic
   behavior.'' --Gregory.

Source : WordNet®

agrestic
     adj 1: characteristic of the fields or country; "agrestic
            simplicity"; "rustic stone walls" [syn: {rustic}]
     2: (of behavior) rustic and uncouth; "the agrestic behavior of
        a country boy"