LATIN DICTIONARYLexicon Latīnum
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“adversary” in Latin

The English word adversary itself goes back to Latin adversus, through adversārius.

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

adversary
adversarius (any opponent, in the field, politics, a court ofjudicature, etc.): qui contra dicit: qui contra disputat (opponent in a learned argument): qui alicui adversatur (of any opponent). In the speeches of an advocate, the opponent is mostly designated by iste, without any contemptuous meaning). To be anybody’s adversary, alicui resistere, obsistere, repugnare (to resist by actions): alicui adversari (to be opposed to anybody’s opinion, wishes, views).
If = enemy. Vid. ADVERSATIVE, adversativus (Priscianus).

Quick answer

What is the Latin word for adversary?
The usual Latin words for “adversary” are adversārius, iste, obsistō; also repugnō, Priscĭānus. 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.