perfidiously

How dreadful, then, is it for sinners to speak to God perfidiously!

Among these captives was young Gustavus Vasa, who, thus perfidiously taken, was cruelly confined.

For it was long believed that Delauney had admitted the people into the first court, and then had perfidiously shot them down.

The Baron could, by a single word perfidiously repeated, injure him very much with Alba's mother.

On the testimony of his own letters it is clear he did not mind how tortuously and perfidiously he worked.