Uncivil, a.
1. Not civilized; savage; barbarous; uncivilized. Men can not enjoy the rights of an uncivil and of a civil state together. Burke.
2. Not civil; not complaisant; discourteous; impolite; rude; unpolished; as, uncivil behavior.
Shades of meaning
Fernald has no entry of its own for uncivil; he lists it under bluff.
He lists it without comment; the entries above explain its neighbors.