LATIN DICTIONARYLexicon Latīnum
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“harmless” in Latin

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

harmless
Inflicting no harm, innocuus (incapable of hurting; anybody, alicui): innoxius (not doing harm to or hurting anybody): innocens (not injuring or hurting, not guilty; all three of persons or things). To be harmless, non or nihil nocere: who does not know that it is not harmless? quis non intelligit rem nocere or noxiam esse?
Unharmed, illaesus (post-Augustan): inviolatus (not harmed by violence or wrong): integer (without hurt or prejudice to his former state): salvus: incolumis (safe): sine damno (without loss).
With reference to character, simplex: candidus: simulationum nescius.

Quick answer

What is the Latin word for harmless?
The usual Latin words for “harmless” are innocuus, innoxius, innocēns; also illaesus, inviolātus, integer. 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.