What is the Latin word for unadvisable?

The usual Latin words for “unadvisable” are inūtilis, supervacāneus. The right choice depends on the sense; see the distinctions below.

English → Latin

“unadvisable” in Latin

inūtilisuseless, unserviceable, unprofitable; hurtful, injurious; void, null, invalid, without any legal use supervacāneusabove what is necessary, unnecessary, needless, superfluous, redundant

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

unadvisable

inutilis (useless): supervacaneus (superfluous). To be unadvisable, alicui or alicui rei non conducere, also ad aliquid: alicui parum prodesse.

Quick answer

What is the Latin word for unadvisable?: The usual Latin words for “unadvisable” are inūtilis, supervacāneus. 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.