LATIN DICTIONARYLexicon Latīnum
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“cogent” in Latin

The English word cogent itself goes back to Latin agō, through cōgēns.

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

cogent
gravis: tirmus or firmus ad probandum: it appears to me that this is a most cogent argument, etc., firmissimum hoc afferri videtur: it does not uppear to me that the reason given by you is a very cogent one, rationem eam, quae a te affertur, non satis firmam puto (Cic.): a very cogent argument, argumentum firmissimum. potentissimum. (Quint.); not cogent, infirmus (Quint.).

Quick answer

What is the Latin word for cogent?
The usual Latin words for “cogent” are gravis, īnfirmus. 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.