southernism

[suhth -er-niz-uh m]

noun

a pronunciation, expression, or behavioral trait characteristic of the U.S. South.

Origin of southernism

An Americanism dating back to 1860–65; Southern + -ism

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Somehow her crisp, cleancut speech (Joan had quite abandoned Southernism) made his own seem hideous, drawling, uncouth.
Why Joan?
Eleanor Mercein Kelly