perfidious[pər fid′ē əs]
- The definition of perfidious is someone or something that cannot be trusted or that is dishonest.
A person who lies all the time is an example of someone who would be described as perfidious.
Origin of perfidiousClassical Latin perfidiosus
(comparative more perfidious, superlative most perfidious)
1590s, from Latin perfidiosus "treacherous," from perfidia