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“illegally” in Latin

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

illegally
contra legem or leges: praeter leges or jura (in violation of them): contra jus fasque; contra fas et jus (against Divine and human laws): injuria: per injuriam (wrongfully; e.g., possidere aliquid): non legitime.

Quick answer

What is the Latin word for illegally?
The usual Latin words for “illegally” are lēx, iūs, iniūria. 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.