perfidious
per·fi·dious
adjective
1.
tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans
- “Punic faith”
- “the perfidious Judas”
- “the fiercest and most treacherous of foes”
- “treacherous intrigues”
Origin
From Latin perfidiōsus (“treacherous”), from perfidia.
Related words
Word family
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.