English → Latin
“irrational” in Latin
brūtusdull, stupid, insensible, unreasonable, irrational; heavy, unwieldymūtusmute, dumb, silent, unable to speak, inarticulate; Used as a specific epithet.dēmōto remove, take away, or subtract; to withhold, take away, subtract fromīnsānusmad, insane, dementedmōlēsmultitude, mass (of material); size; rock, boulder, cliff, ridge, outcrop, knollbēstiaa beast
The English word irrational itself goes back to Latin ratiō, through irratiōnālis.
Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864
irrational
rationis expers (not gifted with reason): brutus (without the faculty or capacity of perception): mutus (mute, unreasonable, inasmuch as speech implies reason; all three of animals): demens (senseless, and also of things that none but a senseless person would do): insanus (mad, deprived of right reason, insane; of men; then also denoting excess; e.g., moles, montes). An irrational animal or being, bestia (opposed to homo). In an irrational manner; Vid: IRRATIONALLY.
Quick answer
- What is the Latin word for irrational?
- The usual Latin words for “irrational” are brūtus, mūtus, dēmō; also īnsānus, mōlēs, bēstia. 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.