What is the Latin word for illegitimately?

The usual Latin words for “illegitimately” are iūs, vitiōsus, nātus. The right choice depends on the sense; see the distinctions below.

English → Latin

“illegitimately” in Latin

iūslaw, right; subjective right, individual right; court of law vitiōsusfull of faults or defects; faulty, defective, bad, corrupt; morally faulty, wicked, depraved, vicious nātusson; children

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

illegitimately

nullo or incerto patre (e.g., natus): adulterino sanguine (sc. natus; SYN. in BASTARD): non legitime (not by lawful authority): praeter leges or jura (in violation of the laws): vitiose (faultily; e.g., of drawing an inference illegitimately).

Quick answer

What is the Latin word for illegitimately?: The usual Latin words for “illegitimately” are iūs, vitiōsus, nātus. 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.