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Webster 1913 Edition

Adj.

[L.

agrestis

, fr.

ager

field.]

Pertaining to fields or the country, in opposition to the city; rural; rustic; unpolished; uncouth.

“Agrestic behavior.”

Gregory.

agrestic ‎(comparative more agrestic, superlative most agrestic)

Of or pertaining to the fields; rural; unpolished.
The author's early days were filled with agrestic surroundings.