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“contradictory” in Latin

The English word contradictory itself goes back to Latin dīcō, through contradictorius.

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

contradictory
contrarius: pugnans, repugnans (of things): diversus (quite different): disparatus (in logic, Vid: Cic., De Invent., 1, 28, 42): obloquens (of persons contradicting). Contradictory things, etc., quae inter se pugnant, repugnant, sunt contraria (Cic.): contradictory assertions, statements, etc., *verba, quae inter se repugnant or non cohaerent. Contradictory laws, leges contrariae (Quint.): to be contradictory, inter se pugnare or repugnare: in maxima inconstantia versari (of opinions, Cic., N.D., 1, 16, 42). To issue contradictory decrees, contrarium decernere atque (paullo ante) decreverat. Vid: CONTRARY.

Quick answer

What is the Latin word for contradictory?
The usual Latin words for “contradictory” are contrārius, pugnō, repugnō; also dīversus, disparō, obloquor. 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.