Sentence:  Al to symple is my tonge to pronounce, / As ministre of my wit, the <WSD>doublenesse</WSD> / Of this chanoun, roote of alle cursednesse! / He semed freendly to hem that knewe hym noght, / But he was feendly bothe in werk and thoght. 
Meaning of the word marked with <WSD> tags:  Behaviour intended to deceive people.