perfidious
adjective/pəˈfɪdiəs/
/pərˈfɪdiəs/
(literary)- that cannot be trusted synonym treacherousWord Originlate 16th cent.: from Latin perfidiosus, from perfidia ‘treachery’.
Want to learn more?
Find out which words work together and produce more natural sounding English with the Oxford Collocations Dictionary app.
Check pronunciation:
perfidious