LATIN DICTIONARYLexicon Latīnum
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“impracticable” in Latin

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

impracticable
quod effici or fieri non potest: quite impracticable, quod nullo pacto fieri potest. Anything is found impracticable, aliquid usus coarguit.
Of persons: rigidus: pertinax: qui regi: flecti, etc.: non potest.
Impassable: invius: difficillimus: impervius (iter, Tac.): impeditus: inexplicabilis (hardly passable, if at all).

Quick answer

What is the Latin word for impracticable?
The usual Latin words for “impracticable” are rigidus, pertināx, flectō; also invius, difficilis, impervius. 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.