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“demeanor” in Latin

The English word demeanor itself goes back to Latin mināre, through *mināre.

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

demeanor
*ratio, qua aliquis utitur adversus aliquem (demeanor in reference to others): mores (moral or external demeanor): vita (demeanor, or manner of living). Cf.,” Demeanor” and its adjective are often expressed together by a substantive; thus: unassuming demeanor, modestia: courteous demeanor, humanitas (in our intercourse with others): friendly, condescending, affable demeanor (especially towards inferiors and dependents), comitas: liberal demeanor, liberalitas: engaging demeanor, dulcedo et suavitas morum: exceedingly engaging demeanor, suavissimi mores: obliging, courteous, respectful demeanor towards others, observantia: prudent demeanor, prudentia: haughty demeanor, superbia: insolent, presumptuous demeanor, insolentia: savage, brutal demeanor, ferocitas (as a characteristic): unseemly demeanor, impudentia: lawless demeanor, intemperantia: to assume a very different demeanor, novum gestum capere (comically): to make anybody assume a new demeanor, alicujus mores mutare (under particular circumstances or events).
Deportment, carriage, gestus: gestus motusque: incessus (gait).

Quick answer

What is the Latin word for demeanor?
The usual Latin words for “demeanor” are mōs, vīta, thūs; also gerō, incēdō, modestia. 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.