LATIN DICTIONARYLexicon Latīnum
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“obstinacy” in Latin

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

obstinacy
animus obstinatus, obstinatio, in anything, alicujus rei (obstinate perseverance): pervicacia, animus pervicax (perseverance in endeavoring to carry out anything, or to gain a victory): pertinacia (obstinacy in an opinion or purpose): animus praefractus; contumacia.

Quick answer

What is the Latin word for obstinacy?
The usual Latin words for “obstinacy” are obstinātiō, pervicāx, pertināx; also contumāx. 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.