— perfidiously , adv. — perfidiousness , n.
/peuhr fid"ee euhs/ , adj.
deliberately faithless; treacherous; deceitful: a perfidious lover.
[ 1590-1600; perfidiosus faithless, dishonest. See PERFIDY, -OUS ]
Syn . false, disloyal; unfaithful, traitorous.
Ant . faithful.