perfidious(pertaining to perfidy) adjective [UK: pə.ˈfɪ.dɪəs] [US: pə.ˈfɪ.dɪəs]The most perfidious way of harming a cause consists of defending it deliberately with faulty arguments. = La forma más pérfida de dañar una causa consiste en defenderla deliberadamente con argumentos falsos.
