LATIN DICTIONARYLexicon Latīnum
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“constancy” in Latin

The English word constancy itself goes back to Latin cōnstantia.

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

constancy
perseverance, perseverantia (that constancy which is not deterred by difficulties): constantia (consistent conduct): assiduitas (unremitting perseverance): pertinacia (pertinacious adherance to anything, e.g., an opinion, design): pervicacia (firmness in endeavouring to attain one’s end): obstinatio: obstinatior voluntas: obstinatus animus (obstinate persistence in; e.g., a resolution, decision): stabilitas (in friendship): animi firmitas (firmness of mind, or constancy of sentiment): of opinion, perpetua in sententia sua permansio. obstinatio sententiae: in faith, obstinatio fidei: anybody does not possess constancy in bearing adversities, minime resistens ad calamitates perferendas mens alicujus est: with constancy, perseveranter: obstinato animo: constanter. [Vid: also, CONSTANTLY].
Patience, patientia (the will to endure sufferings and adversity without flinching; ☞ Cic., De Invent., 2, 54, 163): tolerantia (the energy and perseverance displayed in suffering, with collateral notion of the feeling, but endurance of the misery; generally with genitive; e.g., tolerantia doloris): aequus animus, aequitas animi (equanimity, calmness): to endure sufferings with constancy, pati ac ferre aliquid: perpeti, perferre aliquid (Vid: Liv., 28, 34: Hor., Ep., 1, 15, 17).
Continuance, perpetuitas (uninterrupted duration): perennitas: diuturnitas (long duration): stabilitas (immutability).
Faithfulness, fidelitas (erga amicum, erga patriam): fides: fidus amor (constancy in love, but fidelitas erga conjugem, if conjugal fidelity is meant).

Quick answer

What is the Latin word for constancy?
The usual Latin words for “constancy” are persevērō, cōnstō, assiduitās; also pertināx, pervicāx, obstinātiō. 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.