Where did the word perfidious originate from?
Score: 4.5/5 (41 votes) perfidious (adj.) "faithless, basely treacherous," 1590s, from Latin perfidiosus "treacherous," from perfidia "faithlessness" (see perfidy).Where does the word perfidious come from?The Latin root of perfidy is made up of per, or "through," and fidem, or "faith." So in order f...