Where does “perfidiously” come from?

perfidiously (English) comes from English perfidious, from Latin perfidiōsus, from Latin perfidia, from Latin perfidus, from Latin per, from Latin Ad, from Latin illic, from Latin ille — that.

perfidiously (English): In a perfidious manner

Definitions

  1. In a perfidious manner

Ancestry of “perfidiously”, step by step

StepLanguageWordMeaning
1EnglishperfidiousOf, pertaining to, or representing perfidy;...
2Latinperfidiōsustreacherous, perfidious
3Latinperfidiafaithlessness, dishonesty, treachery, falsehood,...
4LatinperfidusThat breaks his promise; faithless, false,...
5Latinperthrough, by means of; throughout, during
6LatinAdtoward, to
7Latinilliche, she, it, yonder, that, overthere; in that...
8Latinillethat; those; "; demonstrative pronoun "; that...
9LatinolleArchaic form of ille
10Proto-Italic*olnosthat
Every word from Proto-Italic *olnos
perfidiously — Etymology, Origin & Word History | Etymology Explorer