perfid
Translation
perfidious, treacherous, malicious
Examples
Das war ein perfider Plan.
That was a perfidious plan.
Seine perfide Art ist unerträglich.
His treacherous nature is unbearable.
Grammar Patterns
(( )) + to be ... is/was ... His plan was perfidious.
((Adjective)) + ((Noun)) a ... (noun) That was a perfidious lie.
Similar Words
Synonyms: heimtückisch, hinterhältig, treulos; Antonyms: loyal, treu, ehrlich
Etymology
From Latin 'perfidus' (faithless), from 'per-' (through, breaking) + 'fides' (faith). Literally 'breaking faith'.
Memory Tips
Cognate with the English 'perfidious'. Think of 'per-' (against) and 'fides' (like fidelity/faith) - someone acting against faith.