LATIN DICTIONARYLexicon Latīnum
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“conscientiousness” in Latin

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

conscientiousness
religio (conscientiousness towards the gods and all which concerns them; e.g., conscientiousness of a judge who acts faithfully to his oath, etc): sanctitas (severe integrity, as quality of one who, respecting the laws of God and man, shrinks from avarice, rapacity, oppression, etc.): severitas (strict conscientiousness, as quality of him who practises justice and right without partiality): justitia (love of justice and equity): fides (faith and honesty, in general, towards those with whom we deal). (the words are found in this connection and order), religio ac fides: diligentia (exactness, punctuality, in general): conscientiousness in giving advice, religio in consilio dando.

Quick answer

What is the Latin word for conscientiousness?
The usual Latin words for “conscientiousness” are religiō, sānctitās, sevēritās; also iūstitia, fidēs, dīligō. 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.