Which word best describes how the author ironically portrays Mr. Symmes in this line? So spoke this poor, heathenish Kentuckian, who had not been instructed in his constitutional relations, and consequently was betrayed into acting in a sort of Christianized manner, which, if he had been better situated and more enlightened, he would not have been left to do.

The words that best describe how the author ironically portrays Mr. Symmes in this line are, "heathenish" and acting in a sort of "Christianized" manner. The word heathen describes a person who does not belong in any religious group. In short, he is called a pagan. But in this line, it was mentioned that Mr. Symmes was acting like a Christian, which makes this line ironic.