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“precarious” in Latin

The English word precarious itself goes back to Latin prex, through precārius.

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

precarious
incertus: intutus: infidus: parum certus or firmus: ☞ precarius, “obtained by entreaty,” has not the meaning of our “precarious,” though it often approaches it, as opposed to “what is demanded as a right, “, etc. Vid: Latin Dictionary.

Quick answer

What is the Latin word for precarious?
The usual Latin words for “precarious” are incertus, intūtus, īnfīdus; also firmus. 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.