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“unprincipled” in Latin

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

unprincipled
male moratus: malis or corruptis moribus. Sometimes inhonestus: turpis: turpis atque inhonestus. Unprincipled character, mores turpes or corrupti.

Quick answer

What is the Latin word for unprincipled?
The usual Latin words for “unprincipled” are malus, inhonestus, turpis; also corrumpō. 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.