LATIN DICTIONARYLexicon Latīnum
English → Latin

“simple” in Latin

The English word simple itself goes back to Latin semel, through simplex.

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

simple
PROP., simplex (like ἁπλοῦς, in almost all the senses of the English word): attenuatus: nudus (without ornament; of a speech). Simple food, cibus simplex (not artificially prepared): simple dress, vestis non pretiosa: the soul is a simple substance (i. e., not compounded), natura animi simplex est; nihil in animis est mixtum atque concretum.
Plain, Vid:
Artless (as praise rather than not), simplex: sine affectatione (of persons): apertus (open-hearted; homo, animus, etc.): nullo cultu (without ornament or polish; of things): (as blame rather than not), non artificiosus: inconditus.
Wanting art, unskillful, artis non peritus: artis ignarus.
Silly, stupidus: hebetioris ingenii. I am not so simple as to think, etc., non is sum, qui credam etc.: ☞ not simplex in this sense.

Quick answer

What is the Latin word for simple?
The usual Latin words for “simple” are simplex, attenuō, nūdus; also aperiō, inconditus, stupidus. 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.