Source : Webster's Revised Unabridged Dictionary (1913)

Innoxious \In*nox"ious\, a. [L. innoxius. See {In-} not, and
   {Noxious}.]
   1. Free from hurtful qualities or effects; harmless.
      ``Innoxious flames.'' --Sir K. Digby.

   2. Free from crime; pure; innocent. --Pope. --
      {In*nox`ious*ly}, adv. -- {In*nox"ious*ness}, n.

Source : WordNet®

innoxious
     adj : having no adverse effect