Niddering

[O]n the bodies of his fallen foes he kicked the gray road dust, and spat on them and named them churls and nidderings and unfit wearers of the mail of men of war.

Source: wiktionary

I require of thee, as a man of thy word, on pain of being held faithless, man-sworn, and nidering [footnote: Infamous], to forgive and to receive to thy paternal affection the good knight, Wilfrid of Ivanhoe.

Source: wiktionary

Though thou art my son, I say this, that, if thou workest ill to Eric when he is over sea, thou shalt rightly learn the weight of Whitefire: it is a niddering deed to plot against an absent man.

Source: wiktionary