LATIN DICTIONARYLexicon Latīnum
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“rectitude” in Latin

The English word rectitude itself goes back to Latin rēctus, through rectitūdō.

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

rectitude
aequitas (general term): recta ratio (☞ rectitudo very late): probitas (probity): sinceritas (sincerity): fides (good faith): simplicitas (open dealing): integritas (uprightness): abstinentia (refraining from taking what belongs to others): animi candor (ingenuity). Vid: also, HONESTY.

Quick answer

What is the Latin word for rectitude?
The usual Latin words for “rectitude” are aequitās, probitās, sincēritās; also fidēs, simplicitās, integritās. 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.