LATIN DICTIONARYLexicon Latīnum
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“unprofitable” in Latin

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

unprofitable
inutilis. Sometimes frivolus, futilis, inanis. (The words are found in this connection and order.) frivolus et inanis; futilis et frivolus [Vid: USELESS]: ☞ infructuosus, post-Augustan, Plin.

Quick answer

What is the Latin word for unprofitable?
The usual Latin words for “unprofitable” are inūtilis, frīvolus, fūtilis; also inānis. 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.