LATIN DICTIONARYLexicon Latīnum
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“conscientious” in Latin

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

conscientious
religiosus; sanctus; severus; justus [SYN. in CONSCIENTIOUSNESS]. To be conscientious in anything, religionem adhibere: to deviate from the conscientious performance of a duty, a religione officii declinare: in the most conscientious manner, optima fide (e.g., to pay anybody anything, alicui aliquid annumerare); sanctissime (e.g., tueri religiones publicas).

Quick answer

What is the Latin word for conscientious?
The usual Latin words for “conscientious” are religiōsus, sānctus, sevērus; also iūstus. 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.