LATIN DICTIONARYLexicon Latīnum
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“consistent” in Latin

The English word consistent itself goes back to Latin sistō, through consistens.

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

consistent
harmonizing with, consentiens: congruens: concors: consistent with anything, consentaneus alicui rei: decorus alicui or alicui rei: conjunctus cum aliqua re: accommodatus alicui rei or ad rem (fit, proper): aptus alicui rei or ad aliquid (becoming, suitable); (the words are found in this connection and order), aptus et accommodatus: aptus consentaneusque: congruens et aptus: aptus et congruens: consistent with the circumstances or times, consentaneus tempori: ad tempus accommodatus: to be consistent with anything, congruere: convenire: convenientem, aptum, consentaneumque esse alicui rei; respondere alicui rei: also by esse with genitive; e.g., it is consistent with the Gallic custom, that etc., est hoc Gallicae consuetudinis, ut, etc.: he maintained that it was not consistent with the manners of the Greeks, negavit, moris esse Graecorum, etc.: to be consistent with the character one has assumed, and the circumstances of the time, decere: quasi aptum esse consentaneumque personae et temporibus (the latter as definition of the former, by Cic., Oral., 22, 74): not to be consistent with, alienum esse re or a re.
Observing consistency; a consistent person, homo stabilis et constans; a consistent mode of thinking, constantia: to be or remain consistent, sibi constare: secum consentire: se non deserere: sibi consentaneum esse: suis judiciis stare: he would never say this if he cared to be consistent, numquam id diceret, si ipse se audiret (Cic., Tusc., 5, 10, 3): not to be consistent (of persons), a se discedere.

Quick answer

What is the Latin word for consistent?
The usual Latin words for “consistent” are cōnsentiō, congruō, concors. 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.