LATIN DICTIONARYLexicon Latīnum
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“disloyally” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

disloyally
perfide; perfidiose [SYN. in FAITHLESS]; *haud fideli in aliquem animo: contra legem or leges (against the laws; e.g., to act).

Quick answer

What is the Latin word for disloyally?
The usual Latin words for “disloyally” are perfidus, perfidiōsus, lēx. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.