What is the Latin word for convincing?

The usual Latin words for “convincing” are gravis, argūmentum, Rōscius; also cum. The right choice depends on the sense; see the distinctions below.

English → Latin

“convincing” in Latin

gravisheavy; pregnant; troublesome, hard argūmentumargument (as in an argument for a position); evidence, a proof; a point, a theme; a topic, thesis RōsciusLucius Roscius Fabatus, a Roman politician; Lucius Roscius Otho, a Roman tribune cumwith, along with; at (denoting a point in time with which an action coincides); -fold (with ordinal number)

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

convincing

ad persuadendum accommodatus: ad persuasionem appositus: firmus ad probandum (cogent; e.g., argumentum): gravis (weighty; e.g., argumentum; comp. Cic., Roscius, Com., 12, 36); a most convincing proof, argumentum gravissimum et firmissimum. [Quint. uses persuasibilis = πιθανός, in three passages.]

Quick answer

What is the Latin word for convincing?: The usual Latin words for “convincing” are gravis, argūmentum, Rōscius; also cum. 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.