LATIN DICTIONARYLexicon Latīnum
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“reasonableness” in Latin

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

reasonableness
Faculty of reason, [Vid: REASON].
Agreeableness to reason, or relating to the proper use of it, usus rationis: sanitas (soundness of mind which displays itself in the mode of acting of rational beings): prudentia: consilium (prudence, insight).
Compliance with reason, *consensus cum ratione.
Equity, moderateness, aequitas: justitia [SYN. in REASONABLE]: moderatio: liberalitas (reasonableness in thinking or asking, demanding, etc.): to see the reasonableness of anything, aequitatem alicujus rei perspicere.

Quick answer

What is the Latin word for reasonableness?
The usual Latin words for “reasonableness” are sānitās, prūdēns, cōnsilium; also aequitās, iūstitia, moderātiō. 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.